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Outside Air
Hood
Outside Air
Plate
Assembly
2 Wire Ties
Flexible Duct
(not supplied)
• Hearth & Home Technologies Inc recommends using
UL181 Class 0 or Class I rigid or flexible ducting.
• Secure flex duct with metal tape, screws or wire ties.
Figure 7.5 Outside Air Installation
E. Install Outside Air Kit
• Keep duct runs short and straight to minimize restriction.
A small dip is acceptable for a cold air trap.
• The outside air kit must be installed on the left hand side
of the fi replace.
• Locate the air inlet in a clear area, preferably into
prevailing wind during the heating season. Refer to
Figure 5.2.
• Install as shown in Figures 7.3, 7.4 and 7.5.
• The air duct may be run vertically.
• The outside air inlet must be at least 3 ft (.91 m) below
the top of the uppermost chimney section.
CAUTION! Risk of Fire or Asphyxiation! DO NOT
draw outside combustion air from wall, fl oor or ceiling
cavity, or enclosed spaces such as an attic or garage.
• DO NOT place outside air inlet close to exhaust
vents or chimneys. Fumes or odor could be drawn
into the room through the fi replace.
• Locate outside air inlet to prevent blockage from
leaves, snow/ice, or other debris. Blockages could
cause combustion air starvation.
Heatilator • A36R & A42R • 28376 • Rev AF • 11/08