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COMBUSTION AIR ASSEMBLY
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MODEL AK-4 COMBUSTION AIR ASSEMBLY
1. Remove the cover plate from the 4-inch outlet opening location on the left 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 left 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.
53D9028. Rev 1 03/03