Continental Girbau CG145-55 User manual

CG145-55
Installation Manual
WARNING: For your safety the
information in this manual must be
followed to minimize the risk of fire or
explosion or to prevent property dama e,
personal injury or death.
Do not store or use asoline or other flammable
vapor and liquids in the vicinity of this or any
other appliance.
WHAT DO YOU DO IF YOU SMELL GAS
* Do not try to li ht any appliance.
* Do not touch any electrical switch; do not use
any phone in your buildin .
* Clear the room, buildin or area of all
occupants.
* Immediately call your as supplier from a
nei hbor's phone. Follow the as supplier's
instructions.
* If you cannot reach your as supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service a ency or the as
supplier.
AVERTISSEMENT: Assurez-vous de bien
suivre les instructions données dans cette
notice pour réduire au minimum le risque
dincendie ou dexplosion ou pour éviter tout
domma e matériel, toute blessure ou la mort.
Ne pas entreposer ni utiliser dessence ni
dautres vapeurs ou liquides inflammables dans
le voisina e de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR
DE GAZ:
* Ne pas tenter dallumer dappareil.
* Ne touchez à aucun interrupteur. Ne pas
vous servir des téléphones se trouvant dans
le bâtiment où vous vous trouvez.
* Évacuez la pièce, le bâtiment ou la zone.
* Appelez immédiatement votre fournisseur de
az depuis un voisin. Suivez les instructions
du fournisseur.
* Si vous ne pouvez rejoindre le fournisseur
de az, appelez le service des incendies.
Linstallation et lentretien doivent être assurés
par un installateur ou un service dentretien
qualifié ou par le fournisseur de az.
For replacement parts, contact the distributor
from which the dryer was purchased or
Continental Girbau, Inc.®
2500 State Road 44
Oshkosh W 54904
Telephone: [phone] / Fax: [phone]
www.cont-girbau.com
021601GS/rar CGI Part No. A113304

Retain This Manual In A Safe Place For Future Reference
Continental Girbau, Inc.® product embodies advanced concepts in engineering, design, and safety. If this product is
properly maintained, it will provide many years of safe, efficient, and trouble-free operation.
ONLY qualified technicians should service this equipment.
OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation manual included with
the dryer.
The following FOR YOUR SAFETY caution ust be posted near the dryer in a prominent location.
IMPORTANT NOTE TO PURCHASER
Information must be obtained from your local as supplier on the instructions
to be followed if the user smells as. These instructions must be posted in a
prominent location near the dryer.
FOR YOUR SAFETY
Do not store or use asoline or
other flammable vapors or
liquids in the vicinity of this or
any other appliance.
POUR VOTRE SÉCURITÉ
Ne pas entreposer ni utiliser dessence
ni dautres vapeurs ou liquides
inflammables dans le voisina e de cet
appareil ou de yout autre appareil.
We have tried to make this manual as complete as possible and hope you will find it useful. Manufacturer reserves the right
to make changes from time to time, without notice or obligation, in prices, specifications, colors, and material, and to change
or discontinue models.
Important
For your convenience, log the following information
DATE OF PURCHASE ____________________________ MODEL NO. __________________________________________
DISTRIBUTORS NAME ___________________________________________________________________________________
Serial Number(s ________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
Replacement parts can be obtained from your distributor or Continental Girbau, Inc.® Please specify the dryer model
number and serial number in addition to the description and part number, so that your order is processed accurately and
promptly.
CG145-55

IMPORTANT
YOU MUST DISCONTINUE AND LOCKOUT THE ELECTRIC SUPPLY AND THE GAS
SUPPLY OR THE STEAM SUPPLY BEFORE ANY COVERS OR GUARDS ARE
REMOVED FROM THE MACHINE TO ALLOW ACCESS FOR CLEANING,
ADJUSTING, INSTALLATION, OR TESTING OF ANY EQUIPMENT PER OSHA
(Occupational Safety and Health Administration) STANDARDS.
CHILDREN SHOULD NOT BE ALLOWED TO PLAY ON OR NEAR THE DRYER(S).
WARNING
CHILDREN SHOULD BE SUPERVISED IF NEAR DRYERS IN OPERATION.
DRYERS SHOULD NE ER BE LEFT UNATTENDED WHILE IN OPERATION.
CAUTION
FOR YOUR SAFETY
DO NOT DRY MOP HEADS IN THE DRYER.
DO NOT USE DRYER IN THE PRESENCE OF DRY CLEANING FUMES.
WARNING
UNDER NO CIRCUMSTANCES sh uld the dryer d r switches, lint drawer switch,
r heat safety circuit ever be disabled.
Caution: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper operation.
«Attention: Lor des opérations dentretien
des commandes étiqueter tous fils avant
de les déconnecter. Toute erreur de
câblage peut étre une source de danger et
de panne.»

WARNING
The dryer must never be perated with any f the back guards, uter t ps, r service
panels rem ved. PERSONAL INJURY OR FIRE COULD RESULT.
IMPORTANT
PLEASE OBSERVE ALL SAFETY PRECAUTIONS displayed n the equipment r
specified in the installati n manual included with the dryer.
Dryers must not be installed or stored in an area where it will be exposed to water or weather.
The wiring diagram for the dryer is located in the front electrical control box area.
DRYER MUST NEVER BE OPERATED WITHOUT THE LINT FILTER (SCREEN) IN
PLACE, EVEN IF AN EXTERNAL LINT COLLECTION SYSTEM IS USED.
WARNING

Table of Contents
SECTION I
IMPORTANT INFORMATION ............................................................................... 3
A. Receivin and Handlin ............................................................................................................... 3
B. Safety Precautions ...................................................................................................................... 4
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION .................................... 6
A. Specifications (Gas and Steam) ................................................................................................... 6
B. Component Identification ............................................................................................................ 8
SECTION III
INSTALLATION PROCEDURES ......................................................................... 10
A. Location Requirements ............................................................................................................. 10
B. Unpackin /Settin Up ............................................................................................................... 11
C. Dryer Enclosure Requirements .................................................................................................. 13
D. Fresh Air Supply Requirements ................................................................................................. 14
E. Exhaust Requirements ............................................................................................................... 15
F. Electrical Information ................................................................................................................ 21
G. Gas Information ........................................................................................................................ 25
H. Steam Information .................................................................................................................... 29
I. Preparation For Operation/Start-Up ......................................................................................... 33
J. Preoperational Test ................................................................................................................... 34
K. Shut Down Instructions ............................................................................................................. 37
L. Compressed Air Requirements .................................................................................................. 38
SECTION IV
SERVICE/PARTS INFORMATION ...................................................................... 39
A. Service ..................................................................................................................................... 39
B. Parts ........................................................................................................................................ 39
SECTION V
WARRANTY INFORMATION .............................................................................. 40
A. Warranty .................................................................................................................................. 40
B. Returnin Warranty Parts .......................................................................................................... 40

SECTION VI
ROUTINE MAINTENANCE .................................................................................. 41
A. Cleanin ................................................................................................................................... 41
B. Adjustments ............................................................................................................................. 42
C. Lubrication ............................................................................................................................... 42
D. Lint Drawer Removal ................................................................................................................ 43
SECTION VII
DATA LABEL INFORMATION ............................................................................. 44
A. Data Label ............................................................................................................................... 44
SECTION VIII
PROCEDURE FOR FUNCTIONAL CHECK OF REPLACEMENT
COMPONENTS ....................................................................................................... 46
SECTION IX
BURNER AND BASKET (TUMBLER)/LINT CHAMBER MANUAL
RESETHI-LIMIT INSTRUCTION .......................................................................48
Gas Models Only ..................................................................................................................... 48
Electric or Steam Models Only ................................................................................................. 49
SECTIOIN X
REVERSIN TIMER SPIN/DWELL ADJUSTMENTS .................................... 50

3
SECTION I
IMPORTANT INFORMATION
A. RECEIVING AND HANDLING
The dryer is shipped in a protective stretch wrap cover with protective cardboard corners and top cover (or
optional box) as a means of preventing damage in transit. Upon delivery, the dryer and/or packaging, and wooden
skid should be visually inspected for shipping damage. If any damage whatsoever is noticed, inspect further
before delivering carrier leaves.
Dryers damaged in shipment:
1. ALL dryers should be inspected upon receipt and before they are signed for.
2. If there is suspected damage or actual damage, the trucker’s receipt should be so noted.
3. If the dryer is damaged beyond repair, it should be refused. Those dryers, which were not damaged in a
damaged shipment should be accepted, but the number received and the number refused must be noted
on the receipt.
4. If you determine that the dryer was damaged after the trucker has left your location, you should call the
delivering carrier’s freight terminal immediately and file a claim. The freight company considers this concealed
damage. This type of freight claim is very difficult to get paid and becomes extremely difficult when more
than a day or two passes after the freight was delivered. It is your responsibility to file freight claims.
Dryer/parts damaged in transit cannot be claimed under warranty.
5. Freight claims are the responsibility of the consignee, and ALL claims must be filed at the receiving end.
Continental Girbau, Inc.®assumes no responsibility for freight claims or damages.
6. If you need assistance in handling the situation, please contact the Continental Girbau, Inc.®Traffic
Manager at [phone], ext.16.
IMPORTANT:The dryer must be transported and handled in an upright position at ALLtimes.

4
B. SAFETY PRECAUTIONS
WARNING:For your safety, the information in this manual must be followed to minimize the risk of
fire or explosion or to prevent property damage, personal injury, or loss of life.
WARNING:The dryer must never be operated with any of the back guards, outer tops, or
service panels removed. PERSONAL INJURY OR FIRE COULD RESULT.
1. DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
2. Purchaser/user should consult the local gas supplier for proper instructions to be followed in the event the
user smells gas. The instructions should be posted in a prominent location.
3. WHAT TO DO IF YOU SMELL GAS...
a. DO NOT try to light any appliance.
b. DO NOT touch any electrical switch.
c. DO NOT use any phone in your building.
d. Clear the room, building, or area of ALLoccupants.
e. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
f. If you cannot reach your gas supplier, call the fire department.
4. Installation and service must be performed by a qualified installer, service agency, or gas supplier.
5. Dryer(s) must be exhausted to the outdoors.
6. Although Continental Girbau, Inc.®produces a very versatile dryer, there are some articles that, due to
fabric composition or cleaning method, should not be dried in it.
WARNING:Dry only water washed fabrics. DO NOT dry articles spotted or washed in dry
cleaning solvents, a combustible detergent, or “all purpose” cleaner.
EXPLOSION COULD RESULT.
WARNING:DO NOT dry rags or articles coated or contaminated with gasoline, kerosene, oil, paint,
or wax.
EXPLOSION COULD RESULT.
WARNING:DO NOT dry mop heads. Contamination by wax or flammable solvents will create a
fire hazard.
WARNING:DO NOT use heat for drying articles that contain plastic, foam, sponge rubber, or
similarly textured rubber materials. Drying in a heated basket (tumbler) may damage
plastics or rubber and also may be a fire hazard.

5
7. A program should be established for the inspection and cleaning of lint in the burner area, exhaust ductwork,
and area around the back of the dryer. The frequency of inspection and cleaning can best be
determined from experience at each location.
WARNING:The collection of lint in the burner area and exhaust ductwork can create a potential fire
hazard.
8. For personal safety, the dryer must be electrically grounded in accordance with local codes and/or the
National Electrical Code ANSI/NFPA NO. 70-LATEST EDITION, or in Canada, the Canadian Electrical
Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION.
NOTE:Failure to do so will VOID THE WARRANTY.
9. UNDER NO CIRCUMSTANCES should the dryer door switches, lint drawer switch, or heat safety
circuit ever be disabled.
WARNING:PERSONALINJURY OR FIRE COULD RESULT.
10. This dryer is not to be used in the presence of dry cleaning solvents or fumes.
11. Remove articles from the dryer as soon as the drying cycle has been completed.
WARNING:Articles left in the dryer after the drying and cooling cycles have been completed can
create a fire hazard.
12. READ and FOLLOWALLCAUTIONandDIRECTIONLABELSATTACHEDTOTHEDRYER.
13. For safety, proper operation, and optimum performance, the dryer must not be operated with a load less
than sixty-six percent (66%) of its rated capacity.
WARNING:YOU MUST DISCONNECT AND LOCKOUT THEELECTRIC SUPPLY AND
THEGAS SUPPLY OR THE STEAM SUPPLY BEFORE ANY COVERS OR
GUARDS ARE REMOVED FROM THE MACHINE TO ALLOW ACCESS
FOR CLEANING, ADJUSTING, INSTALLATION, OR TESTING OF ANY
EQUIPMENT PER OSHA (Occupational Safety and Health Administration)
STANDARDS.

6
IMPORTANT:Steam dryers must be provided with a clean, dry, and regulated 80 PSI +/- 10 PSI
(5.51 bars +/- 0.68 bars) air supply.
NOTE:Manufacturer reserves the right to make changes in specifications at any time without notice or
obligation.
SECTION II
SPECIFICATIONS/COMPONENT IDENTIFICATION
A. SPECIFICATIONS (GAS AND STEAM)
GasSteam
MAXIMUM CAPACITY (DRY WEIGHT) 155 lbs 70.30 kg
BASKET (TUMBLER) DIAMETER 51-1/2" 130.8 cm
BASKET (TUMBLER) DEPTH 35-1/2" 90.2 cm
BASKET MOTOR 1 HP 0.746 kw
BLOWER MOTOR 5 HP 3.73 kw
DOOR OPENING (DIAMETER) 31-3/8" 79.7 cm
BASKET (TUMBLER) VOLUME 42.8 cu. ft. 1.2 cu. m.
VOLTAGE AVAILABLE 208-460v 3ø 3, 4w 50/60 Hz
APPROX. WEIGHT (UNCRATED) 1,690 lbs 767 kg
APPROX. WEIGHT (CRATED) 1,845 lbs 837 kg
HEAT INPUT NATURAL GAS 395,000 btu/hr 99,540 kcal/hr
L.P. GAS 345,000 btu/hr 86,940 kcal/hr
AIRFLOW 2,700 cfm 76.45 cmm
INLET PIPE SIZE 1-1/4" F.P.T.
COMPRESSED AIR CONNECTION 1/8" F.P.T.
COMPRESSED AIR REQUIREMENT 2.5 cfm @ 80 PSI 0.071 cmm @ 5.51 bars
VOLTAGE AVAILABLE 208-460v 3ø 3, 4w 50/60 Hz
APPROX. WEIGHT (UNCRATED) 1,820 lbs 826 kg
APPROX. WEIGHT (CRATED) 1,975 lbs 896 kg
HEAT INPUT 16 Bhp
STEAM CONSUMPTION 520 lbs. hr 236 kg/hr
AIRFLOW 3,500 cfm 99.10 cmm
INLET PIPE SIZE 1-1/2" M.P.T.
RETURN SIZE 1-1/2" M.P.T.
COMPRESSED AIR CONNECTION 1/8" F.P.T.
COMPRESSED AIR REQUIREMENT 6 cfh @ 80 PSI 0.17 cmh @ 5.51 bars
Shaded areas are stated in metric equivalents

7
NOTE:Steam dimensions are not available at time of printing.
NOTE:Manufacturer reserves the right to make changes in specifications at any time without notice or
obligation.

8
B. COMPONENT IDENTIFICATION
1. Dryer Front View
Illus. No. Description
1Microprocessor Control/Keyboard (touch pad) Panel Assembly (controls)
2Control (top access) Door Assembly
3Main Door Assembly
4Lint Drawer
5Lint Door Assembly
6Wire Diagram (located behind control door)
7Data Label and Installation Label
8Top Console (module) Assembly

9
2. Dryer Rear View
Illus. No. Description
1Basket (tumbler) Drive Motor Assembly
2Blower (impellor/fan) Motor Mount Assembly
3Idler Bearing Mount Assembly
4Basket (tumbler) Bearing Mount Assembly
5* Electric Service Relay Box
6Heating Unit
7Data Label and Installation Label
81/8” Compressed Air Supply Inlet (behind gusset)
9Side Access Opening
10 Front Access Opening
11 Impellor (fan/blower) Assembly
*Electric service connections are made in this box.

10
SECTION III
INSTALLATION PROCEDURES
Installation should be performed by competent technicians in accordance with local and state codes. In the
absence of these codes, the installation must conform toapplicable American National Standards:ANSIZ223.1-
LATEST EDITION (National Fuel Gas Code) or ANSI/NFPA NO. 70-LATEST EDITION (National Electrical
Code) or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91
(Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.] Gas) or LATEST EDITION (for General
Installation and Gas Plumbing) or Canadian Electrical Codes Parts 1 & 2 CSA C22.1-1990 or LATEST EDITION
(for Electrical Connections).
A. LOCATION REQUIREMENTS
Before installing the dryer, be sure the location conforms to local codes and ordinances. In the absence of such
codes or ordinances the location must conform totheNationalFuelGasCodeANSI.Z223.1LATESTEDITION,
or in Canada, the installation must conform to applicable Canadian Standards: CAN/CGA-B149.1-M91 (Natural
Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION (for General Installation and Gas Plumbing).
1. The dryer must be installed on a sound level floor capable of supporting its weight. Carpeting must be
removed from the floor area that the dryer is to rest on.
IMPORTANT: “The dryer must be installed on noncombustible floors only.”
2. The dryer must not be installed or stored in an area where it will be exposed to water and/or weather.
3. The dryer is for use in noncombustible locations.
4. Clearance provisions must be made from combustible construction as noted in this manual (refer to Dryer
Enclosure Requirements in Section C).
5. Provisions must be made for adequate clearances for servicing and for operation as noted in this manual
(refer to Dryer Enclosure Requirements in Section C).
6. Provisions for adequate air supply must be provided as noted in this manual (refer to Fresh Air Supply
Requirements in Section D).
7. Dryer must be exhausted to the outdoors as noted in this manual (refer to Exhaust Requirements in
Section E).
8. Dryer must be located in an area where correct exhaust venting can be achieved as noted in this manual
(refer to Exhaust Requirements in Section E).
IMPORTANT:Dryer should be located where a minimum amount of exhaust duct will be necessary.

B. UNPACKING/SETTING UP
Remove protective shipping material (i.e., plastic wrap, and/or optional shipping box) from dryer.
IMPORTANT: Dryer must be transported and handled in an upright position at ALL times.
The dryer can be moved to its final location while still attached to the skid or with the skid removed. To unskid the
dryer, locate and remove the four ( ) lag bolts securing the base of the dryer to the wooden skid. Two (2) are at
the rear base, and two (2) are located in the bottom of the lint chamber. To remove the two (2) lag bolts located
in the lint chamber area, remove the lint drawer and the three (3) Phillips head screws securing the lint door in
place.
1. Leveling Dryer
a. To level the dryer, place -inch (10.16 cm) square metal shims (refer to the illustration above) or other
suitablematerial under the base pads. It is suggested that the dryer be tilted slightly to the rear.
2. The V-belts are disconnected from the basket (tumbler) drive motor for shipping. Reconnect the V-belts
before starting the dryer.

12
IMPORTANT:The dryer must be transported and handled in an upright position at ALLtimes.
a. To Reconnect V-belts
1) Remove hardware holding the back (belt) guard and remove guard from the dryer.
2) Lay one (1) belt into motor sheave (pulley) groove and wind belt into corresponding groove of idler
pulley by rotating the idler pulley by hand. Rotate the idler pulley an extra turn or two (2) to insure
that the belt is tracking properly in the motor sheave (pulley) and idler pulley grooves without twisting.
3. If more headroom is needed when moving dryer into position, the top console (module) may be removed.
a. To Remove Top Console (Module)
1) Disconnect the ground wire (A) at the rear upper left hand corner of dryer.
2) Remove the eight (8) sets of nuts and washers (B) holding the console (module) to the base.
3) Disconnect white plug connector (C) located on top of the rear electric service/relay box (provides
power to the heat circuit).
4) Disconnect air connection from the 3-way micro valve.
5) Lift the console (module) off of the dryer base.

13
C. DRYER ENCLOSURE REQUIREMENTS
Even though a 12-inch (30.48 cm) clearance is acceptable, it is recommended that the rear of the dryer be
positioned approximately 2 feet (0.61 meters) from the nearest obstruction (i.e., wall) for ease of installation,
maintenance, and service. Bulkheads and partitions should be made from noncombustible
materials. The clearance between the bulkhead header and the dryer must be a minimum of 4-inches (10.16
cm) and must not extend more than 4-inches (10.16 cm) to the rear of the dryer front. A 2-inch (5.08 cm)
clearance is required between the bulkhead facing and the top of the dryer.
NOTE:Bulkhead facing should not be installed until after dryer is in place. Ceiling area must be
located a minimum of 6-inches (15.24 cm) above the dryer’s top console (module) for gas
models and 12-inches (30.48 cm) for steam models.
Even though a minimum of 6-inches (15.24 cm) above the dryer’s top console (module) is
acceptable for gas models and 12-inches (30.48 cm) above the dryer’s top console (module)
is acceptable for steam models, a clearance of 12-inches (30.48 cm) or more for gas models
and 18-inches (45.72 cm) or more for steam models is suggested for ease of installation and
service.
.
NOTE:When fire sprinkler systems are located above the dryers, a minimum of 12-inches (30.48 cm)
above the dryer’s top console (module) is required. Dryers may be positioned sidewall to
sidewall; however, 1 or 2-inches (2.54 or 5.08 cm) is suggested between dryers (or wall) for
ease of installation and maintenance. Allowances must be made for the opening and closing of
the control door and lint door.

14
IMPORTANT:Make-up air must be provided from a source free of dry cleaning solvent fumes.
Make-up air that is contaminated by dry cleaning solvent fumes will result in
irreparable damage to the motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.
D. FRESH AIR SUPPLYREQUIREMENTS
When the dryer is operating, it draws in room air, heats it, passes this air through the basket (tumbler), and
exhausts it out of the building. Therefore, the room airmust be continually replenished from the outdoors. If the
make-up air is inadequate, drying time and drying efficiency will be adversely affected. Ignition problems and sail
switch “fluttering” problems may result, as well as premature motor failure from overheating.
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 2,700 cfm (cubic feet per minute) - 76.45
cmm (cubic meters per minute) - must be supplied to each gas dryer and 3,500 cfm (99.10 cmm) must be
supplied to each steam dryer. As a general rule, an unrestricted air entrance from the outdoors (atmosphere) of
a minimum of 4 square feet (0.37 square meters) is required for each gas dryer and a minimum of 6 square feet
(0.55 square meters) for each steam dryer.
To compensate for the use of registers or louvers used over the openings, this make-up airmust beincreased by
approximately thirty-three percent (33%). Make-up air openings should not be located in an area directly near
where exhaust vents exit the building.
It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are
acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to ALL
the dryers.
EXAMPLE: For a bank of six (6) dryers, two (2) unrestricted openings measuring 3 feet by 4 feet
(0.91 meters by 1.21 meters) - 24 square feet (2.22 square meters) - is acceptable.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.

15
E. EXHAUST REQUIREMENTS
1. General Exhaust Ductwork Information
Exhaust ductwork should be designed and installed by a qualified professional. Improperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, overheating
of the dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or basket (tumbler)
hi-limit thermostats.
CAUTION:DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION:IMPROPERLY SIZED OR INSTALLED EXHAUST DUCTWORKCAN
CREATE APOTENTIALFIREHAZARD.
NOTE:When a dryer is exhausted separately, it is recommendedthat a back draft damper be
installed.
NOTE:When dryers are exhausted into a multiple (common) exhaust line, each dryer must be
supplied with a back draft damper.
The ductwork should be laid out in such a way that the ductwork travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended.
When single dryer venting is used, for horizontal ducting the minimum duct size is 16-inches (40.64 cm) in
diameter, the duct run should not have more than one (1) elbow (including outside protection), and must
not exceed40 feet (12.19 meters) in total length. With single dryer vertical ducting the minimum duct size
is 18-inches (45.72 cm) in diameter, and the duct run should not have more than three (3) elbows (including
outside protection), and must not exceed20 feet (6.1 meters) in total length.
In the case of multiple (common) dryer venting, the distance from the last dryer to the outside exhaust duct
outlet must not exceed 20 feet (6.1 meters), and have no more than one (1) elbow (including outside
protection).
The shape of the ductwork is not critical so long as the minimum cross-sectional area is provided. It is
suggested that the use of 90° turns be avoided; use 30° and/or 45° bends/angles instead. The radius of the
elbows should preferably be 1-1/2 times the diameter of the duct. Including basket (tumbler)/dryer elbow
connections or elbows used for outside protection from the weather, the limits noted abovemust be observed.
If more elbows are used, the cross-sectional area of the ductwork must be increased in proportion to the
number of elbows used.
IMPORTANT:When the ductwork approaches the maximum limits noted in this manual, a
professional heating, venting, and air conditioning (HVAC) firm must be consulted for
proper venting information.
ALL ductwork should be smooth inside with no projections from sheet metal screws or other obstructions,
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be
connected. ALL ductwork joints must be taped to prevent moisture and lint from escaping into the
building. Inspection doors should be installed at strategic points in the exhaust ductwork for periodic
inspection and cleaning of lint from the ductwork.

IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct must not
exceed 0.3 inches (0.74 mb) of water column ( .C.).
IMPORTANT: hen the exhaust ductwork passes through a wall, ceiling, or roof made of
combustible materials, the opening must be 2-inches (5.08 cm) larger than the duct
(ALL the way around). The duct must be centered within this opening.
a. Outside Ductwork Protection
1) To protect the outside end of the horizontal ductwork from the weather, a 90° el ow ent downward
should be installed where the exhaust exits the uilding. If the exhaust ductwork travels vertically
up through the roof, it should be protected from the weather y using a 180° turn to point the
opening downward. In either case, allow at least twice the diameter of the duct etween the duct
opening and the nearest o struction.
IMPORTANT:DO NOT use screens or caps on the outside opening of the exhaust ductwork.
2. Single Dryer Venting
Where possi le, it is suggested to provide a separate exhaust duct for each dryer. The exhaust duct should
be laid out in such a way that the ductwork travels as directly as possi le to the outdoors with as few turns
as possi le. It is suggested that the use of 90° turns in ducting e avoided; use 30° and/or 45° angles instead.
The shape of the exhaust ductwork is not critical so long as the minimum cross section area is provided.
IMPORTANT: Minimum duct size for a dryer is 16-inches (40.64 cm) for a round duct or 14-1/2 x
14-1/2 (36.83 cm x 36.83 cm) for a square duct. THE DUCT SIZE MUST NOT
BE REDUCED ANYWHERE DOWNSTREAM OF THE DRYER.
IMPORTANT: Exhaust back pressure measured by a manometer in the exhaust duct must not
exceed 0.3 inches (0.74 mb) of water column.