Guardian Plus GSFH1K User manual

RESIDENTIAL USE ONLY
INSTALLER: LEAVE THIS MANUAL WITH CONSUMER.
CONSUMER: USE AND CARE INFORMATION
ON PAGES 31 and 35 to 38.
www.GuardianPlusAirSystems.com
www.Broan-NuTone.com 04326 rev 1.
Broan-NuTone LLC 99043105
HEPA Filtration,
Fresh Air and Heat
Recovery*
GSHH3K
*Patents pending
VB0052
INSTALLATION INSTRUCTIONS
AND USER MANUAL
HEPA
Filtration*
GSFH1K
HEPA Filtration and
Fresh Air
Ventilation*
GSVH1K

ABOUT THIS MANUAL
Congratulations! Your purchase of this whole-house HEPA filtration, with optional
ventilation will allow you and your family to enjoy clean and healthy air throughout
your home for years to come!
Please read this manual thoroughly.
Several models are described in this publication. Some details of your unit may be
slightly different than the ones shown, as the illustrations are typical ones.
This manual uses the following symbols to emphasize particular information:
NOTE: Indicates supplementary information needed to fully complete an instruction.
We welcome any suggestions concerning this manual and/or the product, or ways
to better serve you. Please forward all correspondence at the address below:
Broan-NuTone LLC
926 W. State St.,
Hartford, WI 53027
WARNING
Identifies an instruction which, if not followed, might cause serious
personal injuries including possibility of death.
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CAUTION
Denotes an instruction which, if not followed, may severely damage the unit
and/or its components.
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- 3 -
ABOUT THESE UNITS
WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO
PERSON(S) OBSERVE THE FOLLOWING:
1. This unit is intented for residential installation only.
2. Installation must be done in accordance with all applicable codes and
standards, including fire-rated construction codes and standards.
3. This unit is not designed to provide combustion and/or dilution air for
fuel-burning appliances.
4. Do not install in a cooking area or connect directly to an appliance.
5. Before replacing filters, servicing or cleaning unit, disconnect the
power cord from the electrical outlet.
6. When cutting or drilling into the wall or ceiling, do not damage electrical
wiring or other hidden utilities.
7. Do not use this unit with any solid-state speed control device other than
wall controls ACCGSC1 or ACCGSC3, provided with the unit.
8. This unit must be grounded. The power supply cord has a 3-prong
grounding plug for your personal safety. It must be plugged into a mating
3-prong grounding receptacle, grounded in accordance with the national
electrical code and local codes and ordinances. Do not remove the
ground prong. Do not use an extension cord.
9. This unit must be installed in a weatherized location out of direct sunlight
and protected from the elements.
10. Use this unit only in the manner intended by the manufacturer. If you
have questions, contact the manufacturer at the address or telephone
number listed in this document.
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CAUTION
1. For general ventilating use only. Do not use to exhaust hazardous or
explosive materials and vapors.
2. Intended for residential installation in accordance with the requirements
of NFPA 90B.
3. For GSVH1K and GSHH3K units only: Be sure to duct air outside. – Do
not intake / exhaust air into spaces within walls or ceiling or into attics,
crawl spaces, or garage.
4. Do not run any air ducts directly above or closer than 2 ft (0.61 m) to any
furnace or its supply plenum, boiler, or other heat producing appliance.
If a duct has to be connected to the furnace return plenum, it must be
connected not closer than 2 ft (0.61 m) from this plenum connection to
the furnace.
5. The ductwork is intended to be installed in compliance with all local and
national codes that are applicable.
6. To avoid prematurate clogged filters, turn OFF the unit during construction
or renovation.
7. Please read the unit’s specification label on the product for further
information and requirements.

1.0 BEFORE STARTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1 Inspect the Content of the Box . . . . . . . . . . . . . . . .. . 5
2.0 TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Mounting and Servicing Considerations . . . . . . . . . . . . 7
3.0 PLANNING THE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .8
3.1 Planning of the Ductwork . . . . . . . . . . . . . . . . . . . . . .9
4.0 TYPICAL INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4.1 Stand Alone Installation . . . . . . . . . . . . . . . . . . . . . .10
4.2 Central Draw Point Installation . . . . . . . . . . . . . . . . .13
4.3 Return-to-Return Installation . . . . . . . . . . . . . . . . . . . .14
5.0 INSTALL THE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
5.1 Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . .15
5.2 Mount the Ports on the Unit . . . . . . . . . . . . . . . . . . .15
5.3 Installation Using Isolator Pads . . . . . . . . . . . . . . . . .15
5.4 For Suspended Applications . . . . . . . . . . . . . . . . . . .16
5.5 Installing 8” Ducts and Registers . . . . . . . . . . . . . . . .17
5.6 Installing Insulated Flexible Ducts . . . . . . . . . . . . . . .20
5.7 Installing AirDuo™ Exterior Hood . . . . . . . . . . . . . .23
5.8 Installing Two Exterior Hoods . . . . . . . . . . . . . . . . . .25
5.9 Connecting the Drain . . . . . . . . . . . . . . . . . . . . . . .28
5.10 Low Temperature Applications Below Freezing (32°F or 0°C) . . .29
6.0 CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.1 Main Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.2 Wall Controllers . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.4 Installation of the Wall Controllers . . . . . . . . . . . . . .32
6.5 Operating ACCGSC1 Controller . . . . . . . . . . . . . . .35
6.6 Operating ACCGSC3 Controller . . . . . . . . . . . . . . .35
7.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
7.1 Semi-annual Maintenance . . . . . . . . . . . . . . . . . . . . .36
7.2 Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . .38
7.3 Master Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
7.4 Optional Alpine/pine Filter . . . . . . . . . . . . . . . . . . . .38
8.0 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
9.0 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
TABLE OF CONTENTS
- 4 -

VD0126
1 .1 INSPECT THE CONTENTS OF THE BOX
• Inspect the exterior of the unit for shipping damage. Ensure there is no
damage to the door, door latches, main switch, etc.
1) Cardboard strip
•Inspect the interior of the unit for damage. Ensure the blower assembly, heat
recovery core (model GSHH3K), insulation, dampers (models GSVH1K and
GSHH3K), prefilter, HEPA filter, etc. are all intact.
• If the unit was damaged during shipping, contact your local distributor, or
Broan-NuTone at 1 800 558-1711.
1. BEFORE STARTING
CAUTION
Remove the cardboard strip inside the unit (if applicable).
WARNING
To avoid risk of suffocation, discard the plastic bag wrapping the unit.
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2. TECHNICAL DATA
GSFH1K GSVH1K GSHH3K
HEPA Filtration & HEPA Filtration,
Models HEPA Filtration Fresh Air Fresh Air &
Ventilation Heat Recovery
Weight 34 lbs (15.4 kg) 36 lbs (16.3 kg) 40 lbs (18.2 kg)
Oval shaped duct collars
for non-insulated ducts fits two 8” round ducts
to inside
Oval shaped duct collars
for insulated ducts N/A fits two 5” or 6” round ducts
to outside
Installation: Suspended Chains, springs and hooks (provided with the unit)
or rest on a shelf or floor: or 4 pads (provided with the unit)
Electrical Supply 120 Volts AC, 60 Hz
Power Consum. (Boost) 170 Watts 218 Watts 232 Watts
Power Consum. (Normal) 132 Watts 152 Watts 170 Watts
1

HEPA FILTRATION AND HEPA FILTRATION, FRESH AIR
FRESH AIR VENTILATION AND HEAT RECOVERY
MODEL GSVH1K AND MODEL GSHH3K
FRONT VIEW TOP VIEW
- 6 -
2.1 DIMENSIONS
HEPA FILTRATION UNIT, MODEL GSFH1K
FRONT VIEW TOP VIEW
17.8''
(452 mm)
29''
(737 mm)
22.9'' (581 mm)
VK0047
29.4''
(748 mm)
VK0048
17.8''
(452 mm)
22.9'' (581 mm)
2. TECHNICAL DATA (CONT’D)

2. TECHNICAL DATA (CONT’D)
2.2 MOUNTING AND SERVICING CONSIDERATIONS
•The two following pictures are showing the minimum clearance needed to
open the door completely.
22.5” 15.75”
(572 mm) (400 mm)
VD0117
VD0116
22”
(559 mm)
NOTES: 1. The unit’s door is removable. For servicing, a minimum of 15” (381 mm)
clearance from any obstruction in front of the unit is sufficient to open
the door and remove it.
2. A minimum of 8” (203 mm) clearance from any obstruction is required
for the ductwork radius turn.
8”
(203 mm)
VD0118
8 3/4"
222 mm
9 3/4"
248 mm
•The joist opening needed to install the Tandem®tansition must be 9 3/4”
(248 mm) minimum. Also, the maximum height of the Tandem®transition is
8 3/4”(222 mm). See Tandem®transition end view below.
NOTES: 1. If there is not enough space to use the Tandem®tansition, the optional
exterior single hood must be installed to bring the fresh outside air to
the unit. See Section 5.6 and Section 5.8.
2. When installing a HEPA Filtration model GSFH1K, there is no Tandem®
tansition. - 7 -

The Guardian Plus units are versatile appliances capable of delivering filtered air
(model GSFH1K) or both filtered and fresh air to your home (models GSVH1K
and GSHH3K). Because each installation is different, it is recommended you take
the time to plan your installation. The three main areas to plan for are:
• Where to locate the Guardian Plus module
• How to pick-up the room and distribute the filtered or fresh/filtered air
• Where to bring fresh air from outside and exhaust stale air to outside
(models GSVH1K and GSHH3K).
Use the following chart to determine the appropriate installation method for the
unit.
3. PLANNING THE INSTALLATION
YES
YES
NO
NO
Use Stand Alone
installation. See
Section 4.1.
Is there enough space to connect the unit’s
duct(s) to the existing furnace or air handler
ductwork? (The unit’s duct connection must be
performed on the cold air return duct at a
minimum linear distance of 2’ (0.61 m)
upstream from the furnace/air handler drop.)
OR
Example: Basement installation Example: Crawl space installation
Go to Section 4.3.1
Go to Section 4.2.1
CAUTION
Do not connect the unit on any supply furnace duct (hot air). Connect it only
to the cold air return. Do not install duct or duct connector directly above
the furnace. Do not connect the plenum connection closer than 2’ (0.61m)
to the furnace, as measured along the length of the duct.
- 8 -
The Return-to-Return
installation can be per-
formed.
The Central Draw
Point installation can
be performed.
Is the house equipped with a furnace or air handler?

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4. TYPICAL INSTALLATIONS
Installations may vary according to the model number, the product’s orientation
(vertical or horizontal) and the location in the home where the unit is installed. Use the
following illustrations as guidelines to help you decide the appropriate installation.
The unit allows for multi positional mounting (vertical or horizontal). It may be hung
to the joists (preferred method),or it may be laid down on one of three surfaces,
and installed either vertically or horizontally.
NOTE: For more details, see Points 5.3 and 5.4 in Section 5 INSTALL THE UNIT.
In every case, bathroom fans and a range hood should be used as spot ventilation to
exhaust stale air. Also, for homes with more than one level, we recommend placing
one exhaust register at the highest lived-in level.
There are three installation methods: Stand Alone, Central Draw Point* and
Return-to-Return*.
* Different connections to a forced air system.
Multiple furnaces or air handlers may require installation of Guardian Plus on each
system for maximum IAQ benefit.
NOTE: A grounded three-prong electrical outlet has to be available within 3 feet
from the unit.
3. PLANNING THE INSTALLATION
3.1 PLANNING OF THE DUCTWORK
• Keep it simple. Plan for a minimum of bends and joints.
• Keep the length of insulated ducts to the outside of home to a minimum
(not for HEPA Filtration model GSFH1K).
• Do not ventilate crawl spaces or cold rooms.
• If the house has two floors or more, be sure to plan for at least one exhaust
register on the highest lived-in level.
Use the following table to plan the flexible ducts length.
Maximum Maximum
recommended length recommended length
to reach 105 cfm to reach 95 cfm
Insulated fresh air duct
from outside (6” diameter) up to 10’ from 10’ to 20’
Insulated exhaust air duct
to outside (6” diameter) up to 10’ from 10’ to 20’
Recommended Recommended
maximum length maximum length
to reach 270 cfm to reach 240 cfm
Stale air duct from inside
(8” diameter) Combined: 40’ Combined: 60’ with
Filtered air duct to inside stale air duct not to
(8” diameter) exceed 36’
FLEXIBLE DUCT LENGTH TABLE
CAUTION
Do not attempt to recover the exhaust air from a dryer or a range hood. This
would cause clogging of the filters and recovery module (if applicable).

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4. TYPICAL INSTALLATIONS (CONT’D)
4.1.1 BASEMENT
• Ideal for homes without a central furnace in the basement. Allows filtration
and a better air circulation throughout the house.
• Easy access to perform the periodic filter maintenance and servicing.
• Offers an ambient temperature above freezing (32°F - 0°C).
• The HEPA Filtration model GSVH1K has no connection to the outside,
so all parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• Installing the unit near an exterior wall will shorten the length of the
insulated ducts (not necessary for HEPA Filtration only model GSVH1K).
• If a HEPA Filtration Fresh Air & Heat Recovery model GSHH3K is
installed, a water drain must be close to collect the run-off.
VH0039
4.1 STAND ALONE INSTALLATION
(Primarily for homes with no central air mover or equipped with wall furnaces,
radiant hot water or electric baseboard heating.)
Only for the models
GSVH1K and GSHH3K
that use fresh outside air.
Drain required only for the
GSHH3K model.

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4. TYPICAL INSTALLATIONS (CONT’D)
4.1.2 ATTIC
• Ideal for homes without a central furnace, or limited space applications,
allows filtration and a better air circulation throughout the house.
• Only one partition to go through to install the registers.
• No visible ducts.
• The HEPA Filtration model GSVH1K has no connection to the outside,
so all parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• Installing the unit near an exterior wall will shorten the length of the
insulated ducts (not necessary for HEPA Filtration only model GSFH1K).
• If a HEPA Filtration Fresh Air & Heat Recovery model GSHH3K is
installed, a water drain must be close to collect the run-off.
• All ducts must be insulated.
• For the HEPA Filtration Fresh Air & Heat Recovery model GSHH3K
only, if the ambient temperature around the unit drops below freezing
(32°F - 0°C), go to Section 5.10 (Low Temperature Applications) for
instructions on drain line protection and other cold environment installation
details.
4.1 STAND ALONE INSTALLATION
(Primarily for homes with no central air mover or equipped with wall furnaces,
radiant hot water or electric baseboard heating.)
Only for the models GSVH1K and GSHH3K
that use fresh outside air. Drain required only
for the GSHH3K model.
CAUTION
When the ambient temperature for the unit location is below freezing (32°F
- 0°C), the unit must run continuously to prevent condensation.

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4. TYPICAL INSTALLATIONS (CONT’D)
4.1.3 GARAGE CLOSET
• Ideal for homes without a central furnace, or limited space applications,
allows filtration and a better air circulation throughout the house.
• Easy access to perform the periodic maintenance (twice a year).
• The HEPA Filtration model GSFH1K has no connection to outside, so
all parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• Installing the unit near an exterior wall will shorten the length of the
insulated ducts (not necessary for HEPA Filtration model GSFH1K).
• If a HEPA Filtration Fresh Air & Heat Recovery model GSHH3K is
installed, a water drain must be close to collect the run-off.
• All ducts must be insulated.
• For the HEPA Filtration Fresh Air & Heat Recovery model GSHH3K
only, if the ambient temperature around the unit drops below freezing
(32°F - 0°C), go to Section 5.10 (Low Temperature Applications) for
instructions on drain line protection and other cold environment installation
details.
VH0046
4.1 STAND ALONE INSTALLATION
(Primarily for homes with wall furnaces, radiant hot water or electric
baseboard heating.)
Only for the models
GSVH1K and GSHH3K
that use fresh outside air.
CAUTION
When the ambient temperature for the unit location is below freezing (32°F
- 0°C), the unit must run continuously to prevent condensation.

4. TYPICAL INSTALLATIONS (CONT’D)
4.2 CENTRAL DRAW POINT INSTALLATION
(Connection to a Forced Air System)
4.2.1 BASEMENT
• Simplified installation by using the home’s existing ductwork to supply
filtered air throughout the house.
• The central draw point should be located in the main area where most
of the pollutants are produced.
• The furnace/air handler does not need to run continuously.
• Easy access to perform the periodic maintenance.
• Offers an ambient temperature above freezing (32°F - 0°C).
• The HEPA Filtration model GSFH1K has no connection to outside, so
all parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• Installing the unit near an exterior wall will shorten the length of the
insulated ducts (not necessary for HEPA Filtration only model GSFH1K).
• If a HEPA Filtration Fresh Air & Heat Recovery model GSHH3K is
installed, a water drain must be close to collect the run-off.
VH0040
Only for the models
GSVH1K and GSHH3K
that use fresh outside air.
Drain required only for the
model GSHH3K.
- 13 -

4. TYPICAL INSTALLATIONS (CONT’D)
4.3 RETURN-TO-RETURN INSTALLATION (Connection to a Forced Air System)
4.3.1 CRAWL SPA C E
• Simplify the installation by using the existing ductwork.
• Non-visible ducts.
• The HEPA Filtration model GSFH1K has no connection to outside, so
all parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• Installing the unit near an exterior wall will shorten the length of the
insulated ducts (not necessary for HEPA Filtration model GSFH1K).
• If a HEPA Filtration Fresh Air & Heat Recovery model GSHH3K is
installed, a water drain must be close to collect the run-off.
• To avoid the cross-contamination and achieve highest efficiencies, the
furnace / air handler blower must always be ON (or the efficiency will
be affected).
• The HEPA Filtration Fresh Air Ventilation model GSVH1K needs to be
ON all the time, since it doesn’t have motorized dampers. If this unit is
OFF, then the furnace / air handler will draw cold outdoor air inside.
• All ducts must be insulated.
• For the HEPA Filtration Fresh Air & Heat Recovery model GSHH3K
only, if the ambient temperature around the unit drops below freezing
(32°F - 0°C), go to Section 5.10 (Low Temperature Applications) for
instructions on drain line protection and other cold environment installation
details.
VH0043
Only for the models GSVH1K and
GSHH3K that use fresh outside air.
- 14 -
CAUTION
When the ambient temperature for the unit location is below freezing (32°F
- 0°C), the unit must run continuously to prevent condensation.

5.2 MOUNT THE PORTS ON THE UNIT
Mount the 8” oval ports and the 5” to 6” oval
ports on the top of the unit using the screws
provided in the hardware box (4 screws
#8 x 3/4” long per port).
NOTES: 1. Although 4 screws are provided
and prefered; only 1 screw per
port is required to meet code.
2. The HEPA Filtration only model
has no 5” to 6” oval ports.
3. Do not install the front 8’’ oval port
(item 1in illustration) at this time.
VO0018
5. INSTALL THE UNIT
- 15 -
5.1 TOOLS AND MATERIALS
Here are the tools and materials needed to perform the installation:
•Phillips screwdriver #2 or Robertson #1
•Hammer and flat blade screwdriver (for plenum connection installation
only, to make holes in existing metal duct)
•Scissors or utility knife (to cut duct tape)
•Duct tape
•Tin snips or metal shear (for plenum connection installation only, to cut
ductwork)
•Aluminum duct tape (for plenum connection installation only)
•Jigsaw (except for the HEPA Filtration model GSFH1K)
•Extension cord
•Caulking gun and caulking (except for the HEPA Filtration model GSFH1K)
•6’’ Diameter insulated ducting (except for the HEPA Filtration model GSFH1K)
•8’’ Diameter insulated ducting.
NOTE: A 3-prong grounded 120 volt AC power outlet must exist or be installed
within 3 ft of the unit, prior to unit installation.
5.3 INSTALLATION USING ISOLATOR PADS
If the unit cannot be hung, use the four adhesive square isolation pads provided
with the unit. According to your needs and model (with or without drain), you can
install the unit either in vertical or horizontal position.
CAUTION
When a HEPA Filtration Fresh Air & Heat Recovery unit model GSHH3K is
installed with adhesive isolator pads, keep a minimum clearance of 4”
between the unit and the ground (or shelf) for the drain.
1
CAUTION
Make sure the unit is level.

VERTICAL POSITION - ALL MODELS
HORIZONTAL POSITION (LEFT SIDE)
ALL MODELS
HORIZONTAL POSITION (RIGHT SIDE)
MODELS GSFH1K AND GSVH1K ONLY
VD0075 VD0076
5. INSTALL THE UNIT (CONT’D)
CAUTION
Make sure the unit is level.
5.4 FOR SUSPENDED APPLICATIONS
Use the four chains and springs in the hardware pack provided with the unit.
According to your needs and model type, you can install the unit either in a vertical
or horizontal position.
•Verify the switch knob is in the OFF position
in order to unlock the door. Unlatch the
door, using the 2 latches to open and
remove by sliding it out of its hinge. Using a
screwdriver, remove the two retaining
screws of the front plate as shown, and
carefully remove the front plate from the unit.
VO0019
- 16 -

5.4 FOR SUSPENDED APPLICATIONS (CONT’D)
•Insert the four hooks in the square holes and fix
them to the unit using four screws #8 - 32 x 3/4”.
NOTE: To wire the wall control, go to Section 6.2 to 6.4.
•Reinstall the front plate and the door.
•Hang the unit to the joists, using four
#8 x 1 1/2” screws, four chains and
four spings. See illustration.
5.5 INSTALLING 8’’ DUCTS AND REGISTERS
5.5.1 STAND ALONE SYSTEM (AS ILLUSTRATED IN SECTION 4.1)
Stale air collection ductwork
• Install the stale air collection register in the main area where the contaminants
are produced: kitchen, living room, etc. Position the register as far from any
stairway as possible and in a way the air circulates all the lived-in spaces in
the house.
• If the register is installed in the kitchen, it must be located at least 4’ (1.2 m)
from the range.
• Install the register 6”-8” (152 to 203 mm) from the ceiling on an interior wall
OR install it in the ceiling.
Fresh / Filtered air distribution ductwork
• Install the fresh / filtered air distribution register in a large, open area in the
lowest level to ensure the greatest possible air circulation. Keep in mind the
filtered air register must be located as far as possible from the stale air
collection point.
• Install the register 6”-8” (152 to 203 mm) from the ceiling on an interior wall
OR install it in the ceiling. The duct length should be at least 15’ (4.6 m).
(The filtered air will then flow through the room and mix with room air, ensuring
a continuous recirculating airflow.)
- 17 -
VD0077
5. INSTALL THE UNIT (CONT’D)
VO0020
WARNING
Never install a stale air exhaust register in a closed room where a combustion
device operates, such as a gas furnace, a gas water heater or dryer, or a fireplace.
0
!

5.5 INSTALLING 8’’ DUCTS AND REGISTERS
5.5.1 STAND ALONE SYSTEM (AS ILLUSTRATED IN SECTION 4.1)
How to connect the 8’’ flexible duct to the registers and unit’s duct connector.
• Once the register location
is determined, cut out a
10-1/4’’ x 6-7/8’’ (260 mm x
175 mm) hole. Run one
end of the 8’’ flexible duct
through the hole and fix it
to the duct connector (1),
using a 30’’ tie wrap and
duct tape. Fix the duct
connector to the wall (or
ceiling) using its four plastic
anchors and #8 x 3/4”
screws. Then, snap on the
register (2).
• Each port is identified on top of the unit (See illustrations below). Using the
provided colored sticker dot, identify which duct it is (red dot for
stale airflow and blue dot for filtered airflow). Repeat the procedure for the
other register.
• Attach the fresh air to building duct (the one with the blue dot) to its corresponding
port, using tie wrap (1). Then, attach the exhaust air from building duct (the
one with the red dot) to the other 8’’ port (2).
NOTE: Use 8’’ insulated duct only (not included).
- 18 -
5. INSTALL THE UNIT (CONT’D)
VD0078
1
2
12

5.5 INSTALLING 8’’ DUCTS AND REGISTERS (CONT’D)
5.5.2 CENTRAL DRAW POINT (AS ILLUSTRATED IN SECTION 4.2)
Stale air ductwork
Same as for Stand Alone System, described in point 5.5.1.
Filtered air ductwork (Return side connection)
• Trace a 10 -1/4’’ long x 6 -7/8’’ high
(260 mm x175mm) opening on
the furnace/air handler return
duct at a minimum linear
distance of 2 ft (0.61 m)
upstream (return side) from
furnace / air handler.
• Using a metal shear or a hammer and a flat
blade screwdriver, punch a hole into the
furnace/air handler return duct. Then, using
metal shear, cut out the rectangular hole.
• Fix the duct connector to the furnace / air
handler duct using the provided four retaining
screws (#8 x 3/4”). Seal with UL approved
duct tape.
• Take one end of the 8’’ flexible duct and slide
it over the duct connector. Secure with a tie
wrap. Carefully seal the connection with UL
approved duct tape. Identify the duct using
the blue sticker dot included.
• Attach this duct to the
FRESH AIR TO BUILDING
port (see icon on the top of the unit) using tie
wrap and duct tape.
WARNING
When performing duct connections, always use approved tools and
materials. Respect all corresponding laws and/or safety regulations. Please
refer to your local building code. Use only UL listed duct tape.
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!
5. INSTALL THE UNIT (CONT’D)
VD0128A
2 ft minimum
SUPPLY
RETURN
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5. INSTALL THE UNIT (CONT’D)
5.5 INSTALLING 8’’ DUCTS AND REGISTERS (CONT’D)
5.5.3 RETURN-TO-RETURN
(AS ILLUSTRATED IN SECTION 4.3)
Filtered air ductwork (Return side connection)
Same as for Central draw Point, described in point 5.5.2.
Stale air ductwork (Return side connection)
• Located the return air inlet duct at least
2’ (0.61 m) upstream (return side) from
furnace / air handler. Locate the take-off
duct opening at least 3’ (0.9m) from the
filtered air ductwork connection. Proceed
as for the filtered air ductwork, but
instead of using the blue dot sticker to
identify the duct, use the red dot.
• Attach this duct to the
EXHAUST AIR FROM
BUILDING port (see icon on the top of the
unit) using tie wrap and duct tape.
5.6 INSTALLING INSULATED FLEXIBLE DUCTS (GSVH1K AND GSHH3K MODELS ONLY)
Use the following procedure for connecting the insulated flexible ducts to the Tandem®
transition* (
EXHAUST AIR TO OUTSIDE and FRESH AIR FROM OUTSIDE ).
NOTE: If the joists are perpendicular to the ducts, or if the connection to the exterior
hood is in a limited area your installation will need two exterior hoods
instead of one AirDuo™ exterior hood. In this case, do not use the
Tandem®transition. Refer to the optional single hood enclosed instructions.
*Patent pending.
CAUTION
Make sure the insulated ductwork’s vapor barrier does not tear during
installation.
WARNING
When performing duct connections, always use approved tools and
materials. Respect all corresponding laws and/or safety regulations. Please
refer to your local building code. Use only UL listed duct tape.
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!
Minimum 3’
(0.9 m) from
filtered air
ductwork
connection
SUPPLY
RETURN
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