Vermont Castings SB38 Nstallation, Operation And Maintenance Manual page 27

outSide combuStioN air precautioNS & recommeNdatioNS
o u t S i d e c o m b u S t i o N
recommeNdatioNS
1. Extremely long runs and numerous turns in the duct
leading from the fireplace to the combustion air
assembly should be avoided. These conditions will
increase the resistance to the free flow of air through the
duct. Refer to Figures 3, 4, 31 and 32 for methods of
installing the outside air for combustion assemblies.
. The combustion air assembly should be located at an
exterior location, which is not likely to be accidentally
blocked in any manner. The assembly should be located
above the snow line to prevent blockage by snow
accumulation.
Figure 32
6" Diameter Hole
Duct
Extending
3" min.
FP1904
AK4 Inlet Air Vent
combustion air assembly
1 2
Loop Disengaged Slip Band
Clamp Around Through
Duct Housing
87D0057
FP1906
Duct connector
8/08
a i r
(continued)
Screw
2"
App.
3
Snap Screw
Down and
Tighten
FP1906
SB38 / SB44 Series Woodburning Fireplace
3. The combustion air inlet assembly should never be
mounted in a garage or storage area where combustible
fumes such as gasoline might be drawn into the
fireplace.
4. Combustion air can be drawn form the crawl space
under a house when an adequate supply of air is
provided by open ventilation.
5. Do not take combustion air from attic space or garage
space.
Outside Air Control Lever
(Lift to Open Pull Down
to Close)
Nail
Holes
Screws
installation of the duct connector
1. Push the insulation back approximately " from the end of each
duct.
. Slip each duct over the duct connector until an equal length of the
connector extends into each duct.
3. Place a duct clamp over the end of each duct and tighten down
snugly.
4. Push the insulation back into place and over the duct clamp.
Duct Connector
FP1907
FP4
FP2242
outside air lever
Insulation
Approximately
2"
Duct Clamp
Duct
7