Specifications

6
87D0058
SB50HB Series Woodburning Fireplace


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.
. 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.
 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.