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OuTSIde COMBuSTION aIr preCauTIONS, reCOMMeNdaTIONS & aSSeMBLy
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, 28 and 29 for methods of
installing the outside air for combustion assemblies.
2. 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.
6" Diameter Hole
Duct
Extending
3" min.
FP1904
AK4 Inlet Air Vent
Combustion air assembly
Outside Air Control
Lever
(Lift to Open, Pull
Down to Close)
Figure 29
87D0058
a I r
(continued)
Screw
Nail
Holes
Screws
FP2232
SB50HB 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 from 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.
MOdeL ak-4 COMBuSTION aIr aSSeMBLy
1. Remove the cover plate from the 4-inch outlet
opening location on the left or right outside of the
fireplace. DO NOT remove the cover if the outside
air will not be connected.
2. Place the insulation ring between the AK-4 starting
collar and fireplace wall and place the starting collar
(4 inch) into the hole on the side of the fireplace.
Fasten it in place with the four sheet metal screws
provided.
3. Cut a 6-inch diameter opening for model AK-4 in
the outside wall covering where the outside vent
is to be located.
4. Select and cut a piece of duct sufficient length to
attach to the fireplace and protrude at least three
inches beyond the face of the wall to which the
AK-4 inlet air vent will be attached. The duct may
be cut with a standard pocket knife (use FP-4 U
duct for maximum efficiency and safety). Do not
use a combustible duct. Always use UL Listed
Class 0 or 1 duct material.
5. If the duct is the insulated type, push the insulation
back from one end of the duct approximately two
inches.
6. Slip the exposed end of the duct over the starting
collar on the fireplace.
7. Using the sheet metal screws provided, secure the
duct end to the collar attached to the fireplace.
8. Nail or screw the combustion air assembly to the
surface of the wall.
NOTe: If the wall covering is brick or stone, use
appropriate masonry fasteners. Mount the combustion
air assembly with "TOP'" upward to prevent cold air
from entering through the wall. If it is necessary to
splice the duct, a model 403-duct connector should
be used to splice duct sections.
25
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