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G. Outside Air Kit
When you install the outside air kit, Vermont Castings
Group recommends you utilize the shortest duct run to op-
timize the performance of the outside air kit. The outside
air inlet hood should be positioned in a manner that will not
allow snow, leaves, etc. to block the inlet. In some instal-
lations the air duct may need to be run vertically. In such
an installation, a 3 ft (914 mm) height difference must be
maintained from the top of the uppermost chimney section
to the outside air inlet hood.
Refer to Figures 3.8 and 3.9 when placing the outside air
inlet hood.
Installation
•
Remove the cover plate from the side of the fireplace and
replace it with outside air plate assembly using existing
screws.
•
Mark and cut out a 4 1/2 in. (114 mm) diameter hole in
the building side for air entry. This hole should allow for
some framing (two sides) so the outside air inlet hood
may be nailed into position, flush with building's outside.
•
Secure flexible duct (not supplied) to the plate assembly.
•
Feed duct through hole to the outside, fasten to the
outside air inlet hood.
•
Fasten outside air inlet hood assembly to the structure
with screws.
•
Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
•
Seal between the outside air inlet hood and the house
with silicone to prevent air infiltration.
CAUTION! Risk of Fire or Asphyxiation! DO
NOT draw outside combustion air from wall,
floor or ceiling cavity, or enclosed spaces such
as an attic or garage.
• DO NOT place outside air inlet hood close to
exhaust vents or chimneys. Fumes or odor
could be drawn into the room through the
fireplace.
• Locate outside air inlet hood to prevent
blockage from leaves, snow/ice, or other
debris. Blockages could cause combustion
air starvation.
14
VCG Designer Series • DSR42 Installation Manual • 4012-134 • Rev A • 02/20/15
CAUTION! Risk of Cuts/Abrasions. Wear protective
gloves and safety glasses during installation. Sheet metal
edges are sharp.
3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.8
NO
Outlet blocked by
snow, leaves, etc.
YES
Clear area
outside
house or in
ventilated
• Use UL181 Class 0 or Class 1 rigid or flexible ducting.
crawl space
• Install with short run or mainly straight duct, except small
dip for cold air trap which will help prevent flow of cold air.
• Secure flex duct with screws or wire ties.
Figure 3.9
Outside Air Installation
Note: Chimney air kit and
11-10 in. /279 -25 4 mm
adapter are not shown,
but are required in Canada.
Outside Air Inlet Locations
NO
Garage or
NO
combustible
Attic space
liquids storage
Factory-built
fireplace
► ►
NO
Outlet placed
higher than 3 ft
below the
termination cap
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