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Hearth & Home Technologies • SMART-WALL-B Air Duct Kit • 4086-348 Rev. D • 3/20
This kit is tested and safe when installed in accordance with
this installation manual. It is your responsibility to read all
instructions before starting installation and to follow these
instructions carefully during installation.
Installation of this kit
MUST
be performed by a qualified
service technician.
The SMART-WALL-B kit is carefully engineered and must
be installed only as specified. If you modify it or any of its
components you will void the warranty, and you may possibly
cause a fire hazard. Installation must be done according to
applicable local, state, provincial, and/or national codes.
CAUTION!
All wiring should be done by a qualified electri
-
cian and shall be in compliance with local codes and with
the National Electric Code ANSI/NFPA No. 70-current (In
the United States), or with the current CSC22.1 Canadian
Electric Code (in Canada).
Pre-Installation
1. Plan the location of the appliance and the warm air duct
run. See Figure 1 for potential installation options.
Venting Guidelines
MAXIMUM
Duct Run = 20 ft. (6.1 m)
MINIMUM
Duct Run = None: For runs out from the appli
-
ance to adjacent room OR down to the room below.
MINIMUM
Duct Run = 31 in. (787 mm) top of appliance
to room above.
• Maintain smooth turns in duct to minimize restriction.
Installation
KNOCKOUT
DUCT COLLAR
Figure 2.
1. Remove the knockout from the side or top (-B models)
of the appliance and discard it. See Figure 2.
Note:
A minimum clearance of 18 inches to any com
-
bustible materials or combustible surfaces such as room
furnishings, furniture, curtains, etc., is required from the fan
housing air outlet. Plan for this clearance prior to installa
-
tion of the SMART-WALL-B kit.
2. Center the duct collar around the exposed hole and
attach it to the appliance with three screws.
Note:
Do this before final positioning of the appliance.
3. Determine the location for the air register/fan housing
assembly. Cut a 5 in. x 13-5/8 in. (127 mm x 346 mm)
hole between framing members (wall studs or floor
joists). The fan and electrical connections must be
accessible for servicing per local code requirements.
4. Mount and secure the fan housing assembly to framing
members so the front surface is 1/4 in. (6 mm) below
the finished wall or floor surface. Use the adjustable
mounting brackets and screws provided in the kit. See
Figure 3 and Figure 4.
Note:
The brackets can be rotated 180º and mounted to
the back side of the 2 x 4 if necessary.
5. Install the air duct run to the appliance duct collar.
Note:
Fold outer poly layer of flexible duct back to maintain
clearance to combustibles on the appliance. Secure
flexible duct to the collar with clamp provided.
KNOCKOUTS
DUCT COLLAR
ADJUSTABLE
MOUNTING
BRACKETS
FINISHED SURFACE
FRONT OF FAN
HOUSING
1/4 IN.
(6 MM)
2 IN. X 6 IN. WALL
FAN HOUSING
13-5/8 IN.
(346 MM)
4-1/2 IN.
(114 MM)
4-3/8 IN.
(111 MM)
18 IN. MIN.
(457 MM) CLEARANCE
TO COMBUSTIBLE
ROOM FURNISHINGS
SUCH AS CURTAINS OR
FURNITURE
Note
: If the fan housing is installed in a 2 x 4 wall, the front
of the housing will protrude approximately 1/2 in. (13 mm)
out of the wall. See Figure 4.
Figure 3
