MHSC SSTB11 Installation, Operation And Maintenance Manual page 21

COMBUSTION AIR ASSEMBLY
Model AK-4 Combustion Air Assembly
1. Remove the cover plate from the 4-inch outlet opening location on the left outside of the fire-
place. 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 start-
ing 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 fire-
place.
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 com-
bustion 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.
87D0174
SSTB11 Woodburning Fireplace
21