Outside Combustion Air Precautions And Recommendations - Vermont Castings SB38 Nstallation, Operation And Maintenance Manual

SB38 / SB44 Series Woodburning Fireplace
Note: The use of outside air for combustion is optional unless required by building codes. It
is only necessary to supply outside combustion air to one side of the fireplace. Use the model
AK4 combustion air kit.
Figure 31
Insulation Ring
Insert Shortest Side of the
Tube through the Fireplace
Outer Wrap to Properly
Seal Against Firebox Wall
and Gasket
Step 1: Secure outside air starting collar to left side of fire-
place with four (4) sheet metal screws provided.
Note: The starting collar extends through the outer fireplace
jacket and will seal against the firebox wall when secured as
indicated.
Duct Extended
to Avoid Joint
To Outside Wall
installation above basement or
crawl Space
6
outSide combuStioN air precautioNS & recommeNdatioNS
Secure outside air Starting collar to fireplace
Longer Length of the Tube
to Outside
FP1900
FP1900
OA start collar
8/08
Second Floor
Firestop
Spacer
FP9
FP2229
above basement
1/09
FP1901
Step 2: Secure outside duct to starting
collar with duct clamp or screws
Fireplace Outer Wrap
Firebox Insulation Seal
Chimney
Cap
Inlet Grille
8' Max.
in Soffit
(Overhang)
concrete Slab installation
(Optional Outside Air Runs)
FP2230
OA soffit install
1/09
.
AK4 Combustion Air
Kit (Shortest Toward
Firebox)
AK4 Mounting Plate
Firestop
cautioN: Do not
take air from attic
spac or garage.
FP30
87D0057