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13
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 12 - External Air Intake
(Detail A)
(Detail C)
Outside Air Assembly
(Fireplace and AC Chimney)
The outside air assembly is mandatory for
the fireplace and the AC chimney.
During operation, the fireplace requires 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 blowers
and blower driven appliances may compete for
air, causing a negative pressure in the home,
resulting in smoke entering the home from
the fireplace. This situation is aggravated in
modern airtight houses.
To overcome this potential problem, the instal-
lation of an outside air assembly is required to
provide outside combustion air to the fireplace.
Outside Air Installation
(Fireplace and AC Chimney)
The outside air assembly must be installed ac-
cording to the following guidelines:
1. The maximum length of 4" I.D. (100 mm)
insulated flexible duct is 20 feet (6.1 m). If a
longer duct is required, use a 6" I.D. (150mm)
insulated flexible duct. The maximum length
is 40 feet (12 m). Refer to Figures 12B and
12C for connections.
2. The duct and register may be installed above
or below floor level.
3. The outside air register must not be installed
more than 10 feet (3.1 m) above the base of
the fireplace.
4. The outside air assembly must draw air from
outside the house. It must not draw air from
the attic, the basement or a garage (see Figure
6 on Page 7).
5. Locate the outside register where it will be
well away from automobile exhaust fumes
or other vents.
6. The outside air register should be installed
where it is not likely to be blocked by snow
or exposed to extreme wind.
7. It is recommended to install the outside air
register at floor level. However, if you must
raise the air register above the fireplace level,
you will have to make a loop to the floor with
the flexible pipe to prevent from causing a
draft in the outside air register (see Figure
12 Detail A).
OUTSIDE AIR CONNECTION
10' Maximum
Loop is Mandatory
(Detail B)
Fireplace
Fireplace
Connection
Aluminum Tape
Flexible Pipe
Plastic Cover
OUTSIDE AIR CONNECTION TO THE FIREPLACE
Plastic
Cover
Insulation
Flexible Pipe
Wall
Opening
Facing Down
Screw
Outside
Intake
Aluminum Tape
Insulated Flex Pipe
(Detail D)