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OUTSIDE AIR KIT
During operation, the fireplace requires fresh
air for combustion and draws air from outside
the house. It may starve other fuel burning
appliances such as gas or oil furnaces. As
well, exhaust fans may compete for air, caus-
ing negative pressure in the house, resulting in
smoke entering the house from the fireplace.
This situation is aggravated in modern airtight
houses. To overcome this potential problem,
we require the installation of an outside air
assembly.
The outside air assembly must be installed ac-
cording to the following requirements :
1. Duct length should be kept to a minimum.
The maximum length of a 4" I.D. (100mm)
insulated flexible duct is 20 feet (6.1 m).
The duct can be extended to a maximum
of 40 feet (12 m) using a 6" I.D. (150mm)
insulated flexible duct.
2. The air intake register must not be installed
more than 7 feet (2135 mm) above the base
of the fireplace.
3. The fresh air must come from outside the
house. The air intake must not draw air from
the attic, from the basement or garage.
4. The air intake register should be installed
where it is not likely to be blocked by snow
or exposed to extreme wind and well away
from automobile exhaust fumes, gas meters
and other vents.
5. The duct and register may be installed above
or below floor level.
Outside Air Installation
Make a 4-1/4" (110 mm) hole in the outside
wall of the house at the chosen location. From
outside, place the outside air register in the
hole (open side down) and fasten the register
to the wall, with screws as shown (see Figure
20). Slip the pipe into the insulated sleeve.
Place the insulated pipe over the register tube
and over the fireplace's outside air connector
(see Figure 21). At each end, carefully pull
back the insulation and plastic cover exposing
the flexible pipe.
Using the aluminium tape provided, wrap the
tape around the joint between the flexible pipe
and the air inlets. Carefully push the insulation
and plastic cover back over the pipe. Using alu-
minium tape, fasten the plastic cover in place.
16
OUTSIDE
INTAKE
SCREW
OPENING FACING
DOWN
WALL
Figure 20
OUTSIDE AIR CONNECTION TO THE FIREPLACE
FIREPLACE CONNECTION
ALUMINUM TAPE
PLASTIC
COVER
INSULATION
FLEXIBLE PIPE
ALUMINUM TAPE
Figure 21
DRAFT REQUIREMENTS
Draft is the force which moves air from the appliance up through the chimney. The amount of draft
in your chimney depends on the length of the chimney, local geography, nearby obstructions and
other factors. Too much draft may cause excessive temperatures in the appliance and may damage
the catalytic combustor. Inadequate draft may cause backpuffing into the room and `plugging' of
the chimney or the catalyst."
Inadequate draft will cause the appliance to leak smoke into the room through appliance and
chimney connector joints.
An uncontrollable burn or excessive temperature indicates excessive draft.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
OUTSIDE AIR CONNECTION
ALUMINIUM TAPE
FLEXIBLE PIPE
FIREPLACE
PLASTIC COVER
INSULATION
WRT4826WH Shown
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