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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Hearth Extension Requirements
(refer to Figure 7)
A non-combustible hearth extension must
be built in front of the fireplace and extend
out on both sides. Hearth extensions must
be constructed according to the following
guidelines:
1. A layer of sheet metal 0.018" (0.45mm) thick
or 3/8" (9mm) thick insulating board or any
other material (tiles, marble, granite) with
equivalent heat resistance may be used.
Check with the local building authorities
before installing to determine what other
materials are acceptable in your area.
2. The hearth extension should be secured to
the floor. The gap between the fireplace and
the hearth extension must be sealed with
non-combustible caulking or cement.
3. On a raised base or raised hearth, a “Z” shape
piece of metal must be fabricated to join the
bottom of the fireplace to the floor.
Outside Air Assembly
The outside air assembly is mandatory for
the fireplace.
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 fans
and fan 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
installation of an outside air assembly is
required to provide outside combustion air to
the fireplace.
Outside Air Installation
The outside air assembly must be installed
according 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 8B and
8C
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 7 feet (2.1 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.
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
8 Detail A).
Figure 8
OUTSIDE
INTAKE
ALUMINIUM TAPE
PLASTIC
COVER
FLEXIBLE PIPE
SCREW
OPENING
FACING DOWN
WALL
OUTSIDE AIR CONNECTION
TO THE FIREPLACE
FIREPLACE
CONNECTION
ALUMINIUM
TAPE
INSULATION
FLEXIBLE
PIPE
FIREPLACE
PLASTIC COVER
LOOP IS MANDATORY
7' MAX.
OUTSIDE AIR CONNECTION
(Detail A)
(Detail B)
(Detail C)