15
VCG Biltmore Series • SB100 • 4013-303 Installers Manual • Rev A • 02/19/15
H. Outside Air Kit
Two outside air kits must be used for combustion.Vermont
Castings Group recommends you utilize the shortest
duct runs to optimize the performance of the outside air
kits. The outside air inlet hoods should be positioned in
a manner that will not allow snow, leaves, etc. to block
the inlets. In some installations 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 hoods.
Refer to Figures 3.14 and 3.15 when placing the outside
air inlet hoods.
An outside air kit is installed on each side of the fireplace.
• Cut 4-1/2 in. (114 mm) holes in outside wall to
accommodate air piping.
• Use 4 in. (102 mm) flex (not supplied) to directly connect
outside air to fireplace intake. Insulate the pipe to prevent
frost condensation.
• Use the supplied outside air inlet hoods.
• Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
• Seal between the outside air inlet hoods and the house
with silicone to prevent air infiltration.
CAUTION! Risk of Cuts/Abrasions. Wear protective
gloves and safety glasses during installation. Sheet metal
edges are sharp.
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.
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3 ft min. from
top of uppermost
chimney section
to air inlet.
Figure 3.14 Outside Air Inlet Hood Locations
Outlet placed
higher than 3 ft
below the
termination cap
Attic space
Garage or
combustible
liquids storage
Outlet blocked by
snow, leaves, etc.
Clear area
outside
house or in
ventilated
crawl space
YES
NO
NO
NO
NO
Factory-built
fireplace
• Use UL181 Class 0 or Class 1 rigid or flexible ducting.
• 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 3.15 Outside Air Installation
