Fresh Air Kit (Optional); Outside Air Installation - Osburn STRATFORD Installation Instructions Manual

2.6

FRESH AIR KIT (OPTIONAL)

During operation, the fireplace requires fresh air for combustion and draws air out of the house. It
may starve other fuel burning appliances such as gas or oil furnaces. As well, exhaust fans may
compete for air, causing 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
problem, we strongly recommend that you install fresh air kit (not included). Check with local
authorities having jurisdiction in your area, it may be mandatory.

2.6.1 Outside Air Installation

The fresh air kit may be installed according to the following requirements:
A) Insulated duct length should be sufficient to avoid condensation.
B) The outside wall termination must not be installed more than 10 ft. (3 m) above the base
of the fireplace.
C) The fresh air must come from outside the house. The air intake must not draw air from the
attic, from the basement, or from a garage.
D) The outside wall termination should be installed where it is not likely to be blocked by
snow or exposed to extreme wind and away from automobile exhaust fumes, gas meter
and other vents.
E) The outside termination may be installed above or below floor level.
F) If more fresh air is needed (airtight house or conduit exceeding 10 ft or 3 m), two intakes
may be installed, providing twice the quantity of incoming fresh air; you may also
increase both conduits to 4 inches, with the use of a 3 to 4 inch adaptor, again increasing
substantially the quantity of incoming fresh air.
The fresh air kit contains the following components:
1- A 3" flex adapter;
2- 2 pipe clamps;
3- An outside air register;
To complete the fresh air kit installation, you will need a 3" insulated flexible pipe. Use the
length required for your installation while respecting the maximum length of 10 ft. (3 m).
Make a 3 1/4" (83 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 27). Place the insulated pipe over the register tube and over the
fireplace's outside air connector (see figure 28). At each end, carefully pull back the insulation
and plastic cover, exposing the flexible pipe. Attach the flexible pipe using pipe clamps. For a
better seal, you may also use aluminum tape. 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. Fix the
plastic in place using aluminum tape.
4- Plate for room air intake;
5- 6 screws;
6- 3" to 4" adaptor.
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