Baker SterilGARD SG303 User manual

OPERATOR’S MANUAL
SterilGARD®
Class II, Type A2
Biosafety Cabinet
MODEL
SG303, SG303-INT, SG303-JPN, SG303-AUS
Revision
Date
Description
F
3/25/15
Updated branding.and split manuals
This manual includes information for installation, operation, maintenance and spare parts. We
recommend that it be kept near the cabinet for ready reference

INTRODUCTION AND WELCOME
It is a pleasure to welcome you to the growing number of customers who own and operate Baker
biological safety cabinets. As the inventors of the laminar flow biological safety cabinet and the leaders
in the field, Baker people take special pride in providing a cabinet that is designed for maximum
performance.
Your new SterilGARD

III Advanceocabinet includes many unique features which are included to give
you superior performance, simpler maintenance and lower life cycle cost. Your SterilGARD

III
Advanceocabinet is designed for both safety and value.
In addition to the high quality you expect from all Baker equipment, this model has been ergonomically
designed to provide the lab user with many exciting design features. The revolutionary ergonomic design
will help prevent repetitive motion injury, reduce fatigue and lab accidents and enhance productivity.
You will find your SterilGARD

III Advanceocabinet suitable for use not only for research and clinical
diagnostic work involving tissue culturing of possibly infectious samples, but also for I.V. drug
preparations and other pharmaceuticals that could have adverse health effects on operators and other
techniques requiring a contamination-free atmosphere.
Please note that all open-front containment cabinets, including this one, are for use with low to moderate
risk agents only. Open-front cabinets do not provide absolute protection for the user. The adequacy of a
cabinet for user safety should be determined on-site by an industrial hygienist, safety officer or other
qualified person. Remember that you, the owner and user, are ultimately responsible and that you use
your cabinet at your own risk.
We recommend that this manual, along with factory test report, be kept near the cabinet for convenient
reference by operators and qualified maintenance personnel. If you have any questions about the use or
care of your new SterilGARD

III Advanceocabinet, please do not hesitate to contact our Customer
Service Department at 800-992-2537 for assistance or e-mail us at [email protected].
Sincerely,
David Eagleson
President
The Baker Company, Inc.
P.O. Drawer E, Sanford, Maine 04073 [phone] 1-800-992-2537 FAX [phone]
Visit our website at www.bakerco.com

i
TABLE OF CONTENTS
I - FUNCTION AND DESCRIPTION OF THE STERILGARD

III ADVANCEO................................ 3
AIRFLOW INSIDE THE BIOLOGICAL SAFETY CABINET.......................................................................3
Fig. 1 Airflow Inside the Cabinet .....................................................................................................................................3
POSITIVE AND NEGATIVE PRESSURE AREAS ..........................................................................................4
ACCESS TO THE WORK AREA .......................................................................................................................4
DESIGN DETAILS................................................................................................................................................4
Performance assurance .....................................................................................................................................................4
Ergonomic enhancements.................................................................................................................................................4
Motor/ blower capacity.....................................................................................................................................................5
One-piece interior wall construction.................................................................................................................................5
Protective screen...............................................................................................................................................................5
All-metal plenums.............................................................................................................................................................5
Recessed stainless steel work surface...............................................................................................................................5
Cabinet exterior panels.....................................................................................................................................................5
Tested HEPA filters..........................................................................................................................................................5
Viewscreen.......................................................................................................................................................................5
Work area lighting............................................................................................................................................................6
Drain Pan..........................................................................................................................................................................6
Air balance adjustments....................................................................................................................................................6
Easy filter access ..............................................................................................................................................................6
Telescoping stand with adjustable feet. (optional)............................................................................................................6
Telescoping stand with castors. (optional)........................................................................................................................6
Solid-state electronic ballast.............................................................................................................................................7
Programmable Logic Controller.......................................................................................................................................7
UniPressure Plenum .........................................................................................................................................................7
Ground Fault Circuit Interrupter.......................................................................................................................................7
Ultraviolet Germicidal Lamp (optional)...........................................................................................................................8
SPECIFICATIONS................................................................................................................................................8
Weight..............................................................................................................................................................................8
Electrical Specifications ...................................................................................................................................................8
Environmental Conditions................................................................................................................................................9
II - PREPARING THE STERILGARD

III ADVANCEO FOR USE........................................................ 9
CHECKING THE CABINET UPON ARRIVAL...............................................................................................9
THE USES OF A BIOLOGICAL SAFETY CABINET.....................................................................................9
LOCATION WITHIN THE LABORATORY..................................................................................................10
INSTALLING THE CABINET..........................................................................................................................10
CONNECTING THE EXHAUST ......................................................................................................................11
Exhaust into the room -...................................................................................................................................................11
Exhaust to the outside -...................................................................................................................................................11
FINAL CONNECTIONS AND TESTS .............................................................................................................12
III PROPER CABINET USE ...................................................................................................................... 14
OPERATOR CONTROLS...................................................................ERROR! BOOKMARK NOT DEFINED.
Figure 2 Operator Controls..............................................................................................Error! Bookmark not defined.
START-UP PROCEDURE .................................................................................................................................15
WORKING IN THE CABINET.........................................................................................................................16
REACTING TO SPILLS.....................................................................................................................................17

ii
DECONTAMINATION ......................................................................................................................................17
CLEANING AND DISINFECTING STAINLESS STEEL..............................................................................18
Simple Cleaning .............................................................................................................................................................18
Disinfection ....................................................................................................................................................................19
USING ANCILLARY EQUIPMENT................................................................................................................19
ABOUT THE HEPA FILTERS..........................................................................................................................19
REMINDERS.......................................................................................................................................................20
IV - ON-SITE CHECKS AND MAINTENANCE PROCEDURES......................................................... 21
THE AIRFLOW BALANCE..............................................................................................................................21
FILTER LEAK TEST.........................................................................................................................................22
AIRFLOW SMOKE PATTERN TEST.............................................................................................................23
CABINET INTEGRITY TEST ..........................................................................................................................23
ELECTRICAL SAFETY TESTS.......................................................................................................................24
MAINTENANCE NOTES...................................................................................................................................24
Cleaning the Work Area.................................................................................................................................................24
Ultraviolet Germicidal Lamp (optional).........................................................................................................................24
Check the Mag Gauge Or Optional Air Flow Monitor(AFM) Regularly .......................................................................24
Replacing the HEPA Filters............................................................................................................................................25
Figure 3 –Downflow Plenum.........................................................................................................................................26
TROUBLESHOOTING......................................................................................................................................27
SG303 DISASSEMBLY INSTRUCTIONS .......................................................................................................30
APPENDIX.................................................................................................................................................... 32
SG303 DIMENSIONAL DRAWING.................................................................................................................33
SG303 LADDER SCHEMATIC.........................................................................................................................34
REPLACEMENT PARTS LIST ........................................................................................................................35
CHANNEL STAND INSTALLATION OR REMOVAL PROCEDURE.......................................................35
STAND ASSEMBLY/LEG EXTENSION PROCEDURE...............................................................................39
WARRANTY................................................................................................................................................. 43

3
I - FUNCTION AND DESCRIPTION OF THE STERILGARD

III ADVANCEO
The SterilGARD

III Advance

is a Class II Type A2 biological safety cabinet of original design. It features
vertical laminar airflow and a front access opening. The unit is designed to protect not only the environment
and the people using the cabinet, but also the product within from airborne contaminants.
Airflow Inside the Biological Safety Cabinet
The SterilGARD

III Advance

cabinet features The Baker Company's momentum air curtain. See Figure 1.
The stainless steel metal diffuser just below the supply HEPA filter creates a faster airflow behind the sash
than over the work zone. The faster airflow in front makes an extremely effective air barrier.
Another feature of the unique Baker design is the high velocity
return air slots, which maximize the cabinet's protective
capability. It is generally accepted that maintaining containment
and a particle free work area is most difficult in the area in
which airflow turbulence is greatest —at the intersection of the
side walls, the front access opening and the work surface.
Turbulence caused by friction will also be found along a
cabinet's side walls. In cabinets without high-velocity return air
slots, this turbulence may also allow contaminants to escape
from the work area, or it may make it possible for unfiltered
room air to enter the work area.
The high-velocity return air slots are located along the side
walls of the work area opening. Air is drawn into the slots at
very high speed, preventing the escape of particulates and
ensuring that no unfiltered air enters the work area. Additional
high-velocity return air slots are located at the top of the sliding
window to prevent gases, vapors or particulates from coming up
behind the window and escaping into the laboratory. In the same
way, they prevent room air from migrating down behind the
window and contaminating the work area.
The airfoil design at the bottom of the sash opening has been
designed to maximize containment while allowing comfort
when performing procedures in the cabinet. The need for the
airfoil in effective biological safety cabinet design has been
documented in research conducted by Baker, the pioneers in
safety cabinet development. Baker has continued this tradition
with the SterilGARD

III Advance

.
Fig. 1 Airflow Inside the Cabinet

4
Positive and Negative Pressure Areas
One of the many features that sets the SterilGARD

III Advance

apart from other biosafety cabinets is the
interaction of positive and negative pressure areas. The small positive pressure plenum is completely
surrounded by a negative pressure area so that any particle passing through is bound to be drawn through the
blower and trapped in a HEPA filter.
From the small positive pressure plenum, which is shown in Figure 1, a portion of the cabinet airflow is
expelled through the exhaust HEPA filter. The remaining air is re-circulated through the supply HEPA filter
where it re-enters the work area at better than Class 10 air. Because the cabinet must take in air to replace
the air expelled through the exhaust filter, the same volume of room air enters the cabinet through the front
access opening and the high velocity return air slots. This air, which does not reach the work area until
passing through the supply HEPA filter, completes the air barrier at the front access opening.
All air is combined under the work surface. From here, the contaminated air is pulled, under negative
pressure, through a plenum up the rear of the cabinet into the motor-blower, which blows it into a positive
pressure plenum. Please note again that the positive pressure plenum is completely surrounded by negative
pressure areas. If a leak should occur in a contaminated negative pressure plenum, such as the side wall or
rear wall, the negative pressure will create suction and pull air in, not allowing it to escape into the operator's
area. If there is a leak from the positive pressure plenum, the surrounding negative pressure area will
recapture the contaminated air and re-circulate it through a HEPA filter.
Access to the Work Area
For easy entry of apparatus into the work area, SterilGARD

III Advance

has a sliding viewscreen. Its ¼”
safety plate glass allows excellent visibility and may be opened to a height of 18-1/4” to permit placement of
items in the work area. The window should be set at a height of 8”. An alarm is provided to remind the
operator if the window is above the maximum position for using the cabinet (see Section III, Proper
Cabinet Use for how to use the viewscreen correctly while the cabinet is in use).
As with other Baker cabinets, the GFCI protected electrical outlets inside the work area are protected by a
separate circuit breaker so that an electrical overload by ancillary equipment won’t affect air handling.
Overloading with electrical equipment should, of course, be avoided in any case (see “Using Ancillary
Equipment”in Section III, Proper Cabinet Use).
Design Details
Performance assurance
Meticulous care in manufacturing is followed by more than 14 separate performance tests prior to
shipment of this cabinet. In addition, a complete factory test report on the performance of this cabinet is
included with this manual.
Ergonomic enhancements
The Baker Company has also included ergonomic enhancements into the design of the SterilGARD

III
Advance

for improved operator comfort and safety. A 10-degree sloped front feature has been

5
incorporated into the design to improve ergonomics so the operator can use the cabinet properly without
sacrificing comfort or safety.
Motor/ blower capacity
A motor/blower's capacity is measured by its ability to provide a nearly constant volume of air as
resistance increases because of filter loading. Verification by a simulated filter-loading test has
established that the SterilGARD

III cabinet is capable of automatically handling a 50% increase in
pressure drop across the filter without reducing total air delivery more than 10%. With the use of the
manual speed control, a 200% increase in the pressure drop across the filter can be handled. This results
in extended filter life, which relates to significant cost savings over the life of the cabinet.
One-piece interior wall construction
The interior side and rear walls of the work area are constructed from a single piece of 16-gauge
stainless steel. It has 7/16” [11.1mm] radius (rounded) corners to help prevent buildup of contaminants
and aid in cleanup.
Protective screen
Located under the work surface at the bottom rear and sides of the return-air plenums, a protective
screen, integral to the interior walls, is provided to prevent wipes and other paper materials from being
drawn into the blower system. This feature eliminates costly decontamination processes and downtime.
The screen affords easy access to trapped materials and should be kept clean at all times.
All-metal plenums
The plenums are constructed entirely of either carbon steel or stainless steel in order to provide strength,
durability, air-tightness and resistance to deterioration.
Recessed stainless steel work surface
The work surface is constructed of corrosion-resistant 16-gauge type 304 stainless steel, with a satin
finish that diminishes light reflection. It is recessed to retain spills, and the radiused corners make for
easy cleaning and disinfection.
Cabinet exterior panels
External panel construction is of 16-gauge cold-rolled steel, or 16-guage stainless steel protected by a
smooth white baked enamel finish.
Tested HEPA filters
Both the downflow and exhaust filters in the SterilGARD

III Advance

are scan-tested HEPA filters.
They are 99.99% effective on particles of 0.3 micron size. Each filter is scan-tested after installation to
assure that there are no leaks >.01% of upstream concentration.
Viewscreen
The cabinet's ¼”safety plate glass sliding viewscreen may be opened to 18-¼ ” for placement of large
items in the work area, and may be fully closed for system shutdown or UV light operation.

6
Work area lighting
The work area is illuminated by two external fluorescent lamps which provide a minimum of 100 foot-
candles of light at the work surface.
Drain Pan
The drain pan is designed with 7/16” radius in all four bottom corners to facilitate cleaning and
disinfection. The work surface supports have been designed to be removable for easy cleaning and to
allow clear unobstructed access to the whole drain pan area during the cleaning procedure. Drainage is
provided by a 3/8” diameter stainless steel ball valve located at the bottom of the drain pan.
Air balance adjustments
Air balancing can be done by either of the following methods. However, it should be done only by a
technician with proper training and equipment (see “The Airflow Balance in Section IV, On-Site
Checks and Maintenance).
•A speed controller adjusts for minor voltage differences and filter loading.
•An adjustable external damper compensates for supply and intake imbalance due to pressure
resistance drop differences of supply and exhaust filters if they are changed at a later date.
Easy filter access
For convenience and ease of service, the downflow and exhaust HEPA filters are installed and removed
through the front of the cabinet without entry into the work area. This is particularly helpful if the
cabinet is connected to an exhaust duct. Filters should be replaced by qualified technicians only.
Telescoping stand with adjustable feet. (optional)
The optional support stand provides the following range of heights:
Stand w/
adjustable feet
Knee
Space
Height
Work
Surface
Height
Overall
Height
Minimum Setting
28 1/8”
30 1/8”
91 1/4”
Maximum Setting
36 5/8 ”
38 5/8 ”
99 3/4”
Telescoping stand with casters. (optional)
The optional support stand with casters provides the following range of heights:
Stand
w/castors
Knee
Space
Height
Work
Surface
Height
Overall
Height
Minimum Setting
28 ”
30 ”
91 1/8”
Maximum Setting
34 ”
36 ”
97 1/8”
Stands are shipped disassembled, providing a smaller package for shipping, handling and installation.
The stand is easily assembled and attached on site to support the cabinet.

7
Note: instructions on assembling and installing the stand are packed in the cardboard box with the
stand.
Solid-state electronic ballast
The SterilGARD

III Advance

features solid-state electronic ballasts for fluorescent and optional UV
light. These ballasts increase reliability, efficiency, service life and reduce heat.
Programmable Logic Controller
SterilGARD

III Advance

is equipped with a programmable logic controller (PLC) enhancing reliability
and diagnostics capability. The PLC is designed to have built-in immunity to momentary voltage
interruption (flicker), electrical noise and vibration. Diagnostic indicators provide easier troubleshooting
of critical components without the need of special instruments. A built-in RS232 communication port
allows for interfacing to building management systems and provides flexibility for adapting options as
they become available.
UniPressure Plenum
The telescoping all steel positive pressure plenum in the SterilGARD

III Advance

provides the user
with a number of desirable features which enhance safety and reliability while reducing down time
during servicing:
1. This unique plenum design directs air across then through the HEPA downflow filter, improving
downflow uniformity, extending filter life and reducing noise.
2. The two piece plenum serves as the filter sealing mechanism providing a continuous and evenly
distributed clamping force around the complete perimeter of the filters. This approach eliminates
potential filter frame damage as experienced with typical approaches, which utilize point forces. This
method assures secure and sealed filters.
3. The filter plenum is mounted to the gasketed upstream side of the filter. The gasket on both upstream
and downstream filter frames reduces the transmission of vibration through the unit from the motor
blower assembly.
4. The motor blower assembly is mounted on a slide plate, which forms one wall of the plenum. This
plate is removed by loosening one screw and disconnecting electrical plug connectors.
5. The two telescoping sections of the plenum are operated by turning two threaded rods in each
section. These screw clamps exert a force on the all-metal plenums, which distributes the clamping
force uniformly to the filter frames.
Ground Fault Circuit Interrupter
The outlets on this unit are protected by a ground fault circuit interrupter (GFCI). The GFCI is designed
to protect the operator from a possible electrical hazard. If the GFCI detects a hazardous condition, it
will cut off electricity to all of the outlets. The button in the center of the left hand outlet will pop out. To
reset the GFCI, correct the cause of the problem, then press the reset button on the GFCI.

8
Ultraviolet Germicidal Lamp (optional)
SterilGARD

III Advance

can be equipped with an ultraviolet (UV) light. The light is controlled by an
on/off switch on the front panel (see Figure 2, Operator Controls).
WARNING
•Do not defeat interlock, UV light is hazardous!
•Eyes and skin should not be exposed to direct ultraviolet light.
•Ultraviolet light should not be relied upon as the sole decontaminating agent. Additional surface
disinfection should be performed both before and after every cabinet use.
•A biological safety cabinet acts as a supplement to good aseptic practices, not as a replacement.
UV lamps lose their effectiveness over time and should be replaced when the intensity at the work
surface drops below 40 microwatts per cm2at a wavelength of 253.5 x 10-9 meters. Be sure to check
regularly.
Specifications
Weight
The weight of the SterilGARD

III, Model SG303 cabinet is 397 pounds with a shipping weight of 534
pounds. With the optional stand, the cabinet weight is 457 pounds with a shipping weight of 594 pounds.
Electrical Specifications
115 VAC, 20A, 1 Phase, 60 Hz
SterilGARD

III Advance

incorporates Baker’s StediVOLT

motor speed controller for the blower
motor. This compensates for minor variations in incoming line voltages.
SterilGARD

III Advance

features one duplex GFCI protected receptacle protected by an internal 5A
self resetting circuit breaker. The unit is furnished with one 16' power cord with terminated with a
NEMA 5-20 plug. The power cord provides the cabinet and internal receptacles with a protective earth
ground and serves as the main disconnect for the cabinet.
The unit is protected with a 20 amp, 250 VAC time delay fuse.
Blower motor (1,625 RPM) 3.20 amps
Fluorescent Light (ballast) 0.49 amps
Duplex outlets (G.F.C.I.) 5.0 amps
Total running load 8.69 amps

9
Environmental Conditions
The SterilGARD

III Advance

is designed to be used under the following conditions:
Indoor use
Altitudes up to 2000 meters
Temperature range from 5C to 40C
Relative humidity up to 80%
Main supply voltage fluctuations not to exceed 10% of the nominal voltage
Maximum relative humidity 80% for temperatures up to 31°C decreasing linearly to 50% relative
humidity at 40°C
Transient overvoltages according to Installation Categories (OVERVOLTAGE CATEGORIES) I, II
AND III (see Annex J). For mains supply the minimum and normal category is II
POLLUTION DEGREE 2
II - PREPARING THE STERILGARD

III ADVANCEO FOR USE
Checking the Cabinet Upon Arrival
Upon receipt of your new SterilGARD

III Advance

, first inspect the exterior of the crate, box and/or skid.
Pay special attention to the red “Drop & Tell” modules indicating possible rough handling.
If there is any visible damage, that fact should be noted on the receiving slip and immediately reported to the
delivering carrier.
Next, remove the packing material and inspect the cabinet itself. Remove it from the skid with a forklift or
other available equipment. If any concealed damage is found it should be reported to the delivering carrier.
A claim for restitution should be filed within 15 days.
Due to the risk of mishandling by trucking companies, The Baker Company has removed certain parts of the
cabinet and packed them separately.
The Uses of a Biological Safety Cabinet
SterilGARD

III Advance

has been designed to provide a work area which protects the experiment from the
environment, and the environment and operator from the experiment. The laminar flow biosafety cabinet is
designed for work with Biosafety Levels 1, 2 and 3 (low to moderate risk) agents as listed in The Center for
Disease Control's "Biosafety in Microbiological and Biomedical Laboratories" U.S. Department of Health
and Human Services, Public Health Service, Centers for Disease Control and National Institutes of Health,
U.S. Government Printing Office, Washington, D.C. 20402. (HHS publication number CDC 93-8395).
Biosafety Level 4 or extremely high risk agents should never be used in this cabinet, except in conjunction
with a one-piece positive pressure personnel suit ventilated by a life support system within a high
containment facility. Please consult the facility safety professional for a proper risk assessment.

10
CAUTIONS
* The use of any hazardous material in the cabinet requires that it be monitored by an industrial
hygienist, safety officer or other qualified individual.
* Explosive or flammable substances should never be used in the cabinet unless a qualified safety
professional has evaluated the risk.
* If hazardous biological work is to be performed, apply the enclosed biohazard decal. This is in
accord with OSHA regulations (volume 39, number 125, Part II).
* If chemical, radiological or other non-microbiological hazards are present, be sure to employ
appropriate protective measures. Call upon a suitably trained individual to monitor the
operation.
Location Within the Laboratory
The ideal location for any biological safety cabinet is in a dead-end corner of the laboratory away from
personnel traffic, vents, doors, windows and any other sources of disruptive air currents. Published research
from The Baker Company and unpublished tests performed at the National Cancer Institute show that if a
draft or other disruptive air current were to exceed the intake velocity of the cabinet, contamination can enter
the work area or escape from it (for more information, contact Baker). Proper placement within the
laboratory is essential.
If the cabinet exhausts air into the laboratory instead of venting to the outside, it is important that there is
adequate space between the top of the cabinet and the ceiling. A solid ceiling located too close to the
exhaust filter will restrict the air and limit the intake velocity. The exhaust filter guard, an inverted “V”
shaped perforated steel plate included with your cabinet, will provide the necessary distance between
exhaust opening and ceiling. If the filter guard is not installed, the cabinet exhaust opening should be no
closer than 2-¾” from the ceiling, to enable proper airflow. Consult with our Customer Service Department
for the implications of this and for alternatives.
Installing the Cabinet
Installation of this cabinet should be carried out in accordance with appropriate OSHA regulations and those
of other regulatory agencies having jurisdiction.
1. Remove the protective container from around the cabinet.
2. Remove the strapping that holds the cabinet to the pallet.
3. Remove the tape that secures the viewscreen, work surface and diffuser.
4. The small cardboard box taped to the work surface contains the drain valve and the exhaust filter guard.
5. If cabinet exhausts its air directly into the laboratory instead of ducting it to the outside, install the
exhaust filter guard on top of the exhaust damper using the two wing nuts installed on the damper.
6. The drain valve must be installed before the cabinet is either installed on the stand or placed on a counter
top.

11
7. If ordered with the optional stand, refer to the stand installation and assembly instructions packed in the
cardboard box with the stand.
NOTE: If you place your unit on the optional stand and you need to move the unit, we recommend
you leave the unit on the stand. If you must take the unit off the stand to move it, disassemble the
stand before moving it and reassemble at the new location.
Connecting the Exhaust
The SterilGARD

III cabinet can operate with filtered exhaust air entering directly into the room, or with
filtered exhaust ducted to the outdoors. Details of these alternatives are as follows:
Exhaust into the room -
Never use the top of the cabinet or the work area for storage purposes, and never use flammable,
explosive or toxic vapors or gases, or substances which generate them, unless a qualified safety
professional has evaluated the risk. The filter removes only particulates and not gases, thus causing the
recirculation of these within the cabinet.
Ensure that the exhaust filter guard is properly installed over the filter opening. The filter guard will
provide the following advantages:
Provide adequate space between filter opening and ceiling for proper airflow.
Prevent potentially damaging objects from being dropped onto the filter.
Prevent objects from being placed over the exhaust opening and reducing the exhaust flow rate.
Exhaust to the outside -
Whenever possible, the filtered exhaust should be canopy connected to its own separate exhaust system.
If it must be channeled into a ganged exhaust system, make sure that the system is not a recirculating
type.
The exhaust requirements for a STERILGARD III Model 303 are as follows:
MODEL
Sash
Opening
Exhaust Volume
(CFM)
Suction
(“ W.C.)
SG303
8”
162
.02
Note: Water column suction is measured directly above the cabinet exhaust damper before any dampers, elbows or other
restrictions.
Exhaust Connection Type
Gap
Exhaust flow rate (min/max)
(CFM)
Suction Min/Max (“ W.C.)
CEC (Canopy)
1”
260/370
.02/.08

12
HEC (Hard)
N/A
162
.02
Note: With optional Air Tight Damper add .10 to the above suction requirements.
You may want to install an indicator light or some other safety device to give warning if the exhaust
system fails. The optional exhaust transition seals around the exhaust damper and terminates in an 8”
diameter by 2” high vertical collar. This design allows direct connection to standard duct work or canopy
connector with an air gap. The transition also has an airtight damper to seal the cabinet for
decontamination and an access panel for leak checking the filter and adjusting the balancing damper.
The transition adds approximately 0.1” w.c. resistance to the system. For more details, please contact
The Baker Company.
While the cabinet contains a damper to adjust for variations in filter resistance and sash opening size, the
building exhaust system should contain provisions to adjust the building system flow and pressure.
Final Connections and Tests
1. The plumbing connection to the service petcocks must be made with great care because the effluent from
a safety cabinet may be biologically hazardous. When present, petcocks are piped within the cabinet. The
external connection uses 3/8” compression fitting at the rear, top or bottom of the cabinet outer sidewall
seal panel. Connection to plant utilities should be made per NFPA by qualified personnel with proper
materials and technique. Flammable gas should not be piped into any cabinet. However, if the risk is
professionally evaluated and a decision is made to install a flammable gas petcock, then an emergency
shut-off valve should be situated in an accessible location outside the cabinet.
2. A 20-amp power cord with a NEMA 5-20P plug is furnished with the SterilGARD

III. It should be
plugged into an appropriate 115 Volt AC, 60Hz, 20 amp dedicated utility outlet.
3. Thoroughly clean the interior of the cabinet. Locate sash at correct access opening height 8”.
4. Press the blower switch. The yellow indicator below the switch should light.
5. Turn on the fluorescent light and make sure the bulb is lit. The lights will not operate unless the blower
switch is on.
6. If your cabinet has been purchased with the optional ultraviolet (UV) light, lower the viewscreen to its
fully-closed position and turn the UV light on to make sure it is operational. The UV light option
features an interlock which prohibits its operation unless the viewscreen is completely closed and the
fluorescent light is turned off.
7. Although all units are carefully tested at the factory, it is advisable that certain other checks are made on-
site by a qualified technician after installation. These include testing the filters for leaks and checking the
air balance of the unit, especially if it is connected to an exhaust system. A description of these tests can
be found in Section IV, On-site Checks and Maintenance.
8. It is also recommended that all personnel who will be using the cabinet study this Operator's Manual to
learn how to use the cabinet most effectively. For additional start up and use procedures, please turn to
Section III, Proper Cabinet Use.

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III PROPER CABINET USE
A biological safety cabinet is a valuable supplement to good sterile technique, but is not a replacement for it.
If the cabinet is not understood and operated correctly, it will not provide an adequate protective barrier.
All activities that are to be performed in your cabinet should first be approved by a competent professional,
such as an industrial hygienist or safety officer, to make sure that the cabinet is appropriate for the work it
will be required to do. This person should monitor the cabinet and its operating personnel at regular intervals
to see that it is being used correctly.
In order to keep the interior workspace clean and free of particulates, all Baker biosafety cabinets are
designed for continuous operation. If the blower is turned off, the unit becomes contaminated with room air.
Therefore it is recommended that the blower is left on at all times.
Operation and Controls
The operator controls with indicators are arranged on the front electrical panel of the cabinet. A number of
switches are arranged in a single membrane switch assembly. [Reference Figure 3]
ALARM
Figure 2: Operator Controls
Ultraviolet (UV) Light On/Off [Optional] –This switch controls the UV light inside the work area if
the UV light option is installed. The viewscreen must be fully closed before the UV light will
turn on. The fluorescent light and the UV light are interlocked. When the viewscreen is closed,
turning the UV light on will automatically turn the fluorescent light off. Turning the fluorescent
light on will automatically turn the UV light off. The UV light will automatically shut off if the
viewscreen is opened. A yellow indicator light located below the switch will illuminate when the
switch is on.
Alarm Mute / Reset
Sash Level Alarm
Blower
On / Off
Auxiliary Outlets
On / Off
Fluorescent Light
On / Off
UV Light
On / Off
Indicator
Lights

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The yellow indicator light below the switch will light when the UV light is turned on. This unit is
also capable of regulating the amount of time the UV light stays on which is determined by the
operator. This function is very useful if the cabinet is to be left unattended for an extended period
of time. To enable the timer, make sure the viewscreen is fully closed and the UV lamp is off.
Depress the UV keypad switch and hold for 3 seconds. The alarm will pulse twice to signify that
the timer mode has been entered. Release the switch. Immediately after, each press and release of
the switch will program the timer to elapse one hour. (one pulse equals one hour, four pulses
equals four hours, ect.) If no pulse is detected from the operator after four seconds, the timer
begins to elapse automatically. The timer can be disabled at any time during or after the timing
sequence by pressing the UV keypad or opening the viewscreen.
Fluorescent Light On/Off –This switch controls operation of the fluorescent light. The cabinet
blower must be on for the fluorescent light to operate. A blue indicator light located below the
switch will illuminate when the switch is on.
Duplex Outlets On/Off –This switch controls the duplex outlets in the work area. A blue indicator
light located below the switch will illuminate when the switch is on.
Blower On/Off –This switch controls the power to the cabinet blower. A green indicator light
located below the switch will illuminate when the switch is on.
Alarm mute/Sash level alarm –For normal operation, the viewscreen must be placed at the allowable
opening of 8” [203.2mm]. The sash alarm will be activated whenever the viewscreen is at a
potentially unsafe position. To mute the audible alarm, press the alarm mute button. The indicator
light located below the switch will continue to flash. After five minutes, if the conditions persist, the
alarm will sound again to remind you to reposition the viewscreen to its proper level. You may press
the alarm reset switch again to mute the audible alarm for an additional five minutes.
Start-up Procedure
1. If the cabinet has not been left running continuously, turn on the blower. An indicator light located
below the switch will illuminate when the switch is on and the running blower will make an audible
sound. Check the readings on the Magnehelic gauge, it should read a pressure consistent with the last
time the cabinet was on.
2. Turn on the fluorescent light. The fluorescent light will not operate unless the UV light is turned off.
Never leave the UV light on while there is anyone in the room, unless viewscreen is fully closed.
3. Check to determine that the drain valve is in the closed position or the drain coupling is capped.
4. Wipe down the interior area of the cabinet with a surface disinfectant. Note: Some disinfectants,
such as bleach or iodine, may corrode or stain the steel surfaces. Good practice is to
thoroughly clean the surfaces afterward with a detergent and rinse with sterile water to
prevent corrosion.
5. Place all materials to be used for the next procedure inside the cabinet on the solid worksurface.
Disinfect the exterior of these materials prior to placing them on the worksurface. Everything
required (and nothing more) should be placed in the cabinet before beginning work so that nothing

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passes in or out through the air barrier, until the procedure is completed. Implements should be
arranged in the cabinet's work area in logical order so that clean and dirty materials are segregated,
preferably on opposite sides of the work area. Blocking the front and rear perforated grilles must be
avoided. If wipes or absorbent towels are used on the work surface, be sure to keep them away from
the grilles.
6. After equipment is in place inside the cabinet, adjust the sliding viewscreen so it is open no higher
than the correct access opening height ( 8”). An alarm will signal if that height is exceeded. This is
important to maintain proper airflow.
7. After the cabinet has run for at least three minutes with the window in the proper position, it is ready
for use.
Working in the Cabinet
1. Hands and arms should be washed thoroughly with germicidal soap both before and after work in the
cabinet. Operators are encouraged to wear long-sleeved gowns or lab coats with tight-fitting cuffs
and sterile gloves. This minimizes the shedding of skin flora into the work area and protects hands
and arms from contamination.
2. Perform all work on the depressed area of the solid work surface. Work with a limited number of
slow movements. Since all of the equipment you need is already in the cabinet, it will not be
necessary to move your arms in and out through the air barrier.
3. Because opening and closing doors in the laboratory causes air disturbance which might interfere
with cabinet airflow, this kind of activity should be kept to a minimum while the cabinet is in use.
Personnel should also avoid walking by the front of the cabinet while it is in use.
4. Avoid using floor-type pipette discard canisters. It is important that your used pipettes be discarded
into a tray or other suitable container inside the cabinet. This reduces the temptation to move in and
out of the work area unnecessarily.
5. Because of the restricted access, pipetting within the cabinet will require the use of pipetting aids.
6. Use good aseptic technique. Procedures done with good technique and proper cabinet methods will
not require the use of a flame. If, however, a safety officer approves the use of flame after evaluating
the circumstances, then a burner with a pilot light such as the "Touch-O-Matic" should be used.
Place it at the rear of the work area where the air turbulence caused by the flame will have the least
possible effect. Flame disturbs the unidirectional airstream and also contributes to the heat load. If
the cabinet blower is unintentionally turned off, the flame could also damage a filter.
7. Tubing for a burner within the cabinet should be resistant to cracking or puncture. Material such as
Tygon tubing is not acceptable for this use.
8. Never operate your cabinet while the viewscreen alarm indicator is on. The operating position of
the sash provides an 8” high access opening, depending on the design set at the factory. This
restricted opening permits optimum operating conditions for the cabinet. Because operators will not
all be the same height, it is suggested that the operator use a chair which may be adjusted for height.
9. After a procedure has been completed, all equipment which has been in contact with the research
agent should be enclosed, and the entire surface decontaminated. Trays of discarded pipettes and
glassware should be covered. The cabinet should then be allowed to run for at least three minutes

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with no activity so that the airborne contaminants will be purged from the work area. Next, make
sure that all equipment is removed from the cabinet.
10. After you have removed all materials, culture apparatus, etc., decontamination of the interior
surfaces should be repeated. Check the work area carefully for spilled or splashed nutrient which
might support bacterial growth. Never use the cabinet to store supplies or laboratory equipment.
11. We recommend that the cabinet be left running continuously to ensure containment and cleanliness.
If the user elects to turn the cabinet off at the end of a work session, the window should be closed
completely. The sash alarm will be silenced when the window is in the closed position.
Reacting to Spills
Consult your safety professional for proper procedures and treatment of the specific agents you plan to use.
Decontamination
Whenever maintenance, service or repairs are needed in a contaminated area of your cabinet, the cabinet
must first be decontaminated by an appropriate agent. The National Institute of Health, National Cancer
Institute and the Centers for Disease Control have all recommended the use of formaldehyde gas for most
microbiological agents. Its application requires individuals who are experienced in the decontamination of
cabinets, since the gas itself is toxic.
A good reference for this procedure is NSF/ANSI Standard 49-2002 ANNEX G “Recommended
Microbiological decontamination Procedure”,NSF International, 789 North Dixboro Road, P.O. Box
130140, Ann Arbor, Michigan 48113-0140.
Whichever gas you choose, have the proper safety equipment (gas masks, protective clothing, etc.) within
easy reach. In addition, you will want to be sure that the gas you are using will be effective against all of the
biological agents within the cabinet. When you have decided which gas to use, post the antidote to it in a
visible and nearby location. The volume of the SG303 cabinet is 30 cubic feet. Provide the correct amount
of decontaminating gas for this volume.
WARNING
Carcinogens and other toxins present a unique chemical deactivation problem and the standard
biological decontamination will not, of course, be effective against chemicals or other non-biological
materials. With materials of this kind, consult a qualified safety professional.
1. Surface-disinfect the inside of the window and all other surfaces on the view screen assembly.
2. Multiply the total volume of the cabinet (30 ft3 by .3 gram/ft3) to determine the amount of
paraformaldehyde required to decontaminate the cabinet. If the cabinet is vented to the outside you must
consider the volume of the duct work in the paraformaldehyde calculation.
3. Prior to sealing up the cabinet make sure all gas or flammable petcocks are closed and pressure tight.
Use a soap bubble solution to make sure there is no leakage. Note: you are creating a confined space.

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4. The inside cabinet work space should be at room temperature with 60% to 85% relative humidity. If
relative humidity is low (10 to 30%) add a pan of boiling water on the work surface. If it is (40% to
55%) add a pan of hot tap water on the work surface. Relatively humidity above 85% will require extra
clean up which will be covered in Step 15.
Note: Without the proper relative humidity the formaldehyde gas will not be effective. The mode
of entry of formaldehyde into the living organisms is through the cell wall by the absorption of
water.
5. Place a heating mantle with paraformaldehyde in the work space. The heating mantle must be able to
reach 450°F and must have a grounded plug which should be plugged in to an outlet outside the cabinet.
6. This step is optional. Place a second heating mantle in the cabinet with 10% more by weight of
ammonium bicarbonate than paraformaldehyde. This will be used later in Step 13 to neutralize the
formaldehyde gas.
7. This step is recommended. Place spore strips inside the cabinet to confirm the decontamination process
has been successful.
8. If the cabinet is vented to the room, use a sheet of plastic and seal the front access and exhaust port
openings. These openings should be sealed such that the exhaust airflow recirculates back to the front
access opening. This will promote the even distribution of formaldehyde gas throughout the cabinet.
9. If the cabinet is vented to the outside, then the exhaust transition should have a means to recirculate the
exhaust airflow back to the cabinet blower. This will promote the even distribution of formaldehyde gas
through the exhaust filter. Seal the front access opening.
10. Turn on the heating mantle containing the paraformaldehyde flakes.
11. After 25% of the paraformaldehyde has depolymerized, turn on the cabinet blower for 10 to 15 seconds.
Repeat after 50%, 75% and 100% of the paraformaldehyde has depolymerized.
12. Allow the formaldehyde gas a minimum residence time of 12 hours, preferably over night.
13. Turn on the heating mantle containing NH4HCO3and the cabinet blower and allow the two gases to
circulate for at least one hour. Then vent the cabinet to the outside.
14. Aseptically remove spore strip and place in trypticase-soy broth and incubate for 7 days. No growth will
verify the decontamination process.
15. When cleaning up, you may find residual paraformaldehyde (white powder) on the metal or glass
surfaces. To remove this, use ammonia in warm water, wear gloves and wipe down the affected surfaces.
The paraformaldehyde will dissolve in water and be neutralized by the ammonia.
Cleaning and Disinfecting Stainless Steel
Simple Cleaning
Caution
Do not use steel wool or steel pads when cleaning stainless steel.
Dirt deposits on stainless steel (dust, dirt and finger marks) can easily be removed. Frequently, warm
water, with or without detergent, is sufficient. If this does not remove the deposits, mild, non-abrasive
household cleaners can be used with warm water and bristle brushes, sponges or clean cloths.