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CAUTION! Risk of Cuts/Abrasions. Wear protective
gloves and safety glasses during installation. Sheet metal
edges are sharp.
•
The hinge will be toward the front of the fireplace.
•
Insert the narrow end of the handle into the upper slot.
•
Pivot the handle in the slot toward the hinge.
•
Remove the cover plate or knockout from the side of the
fireplace and discard. Remove the semi-perforated piece
of insulation covering the opening (insulated fireplaces
only).
•
Partly open the air kit door and insert the handle into the
appropriate hole in the side column of the fireplace. The
hinge on the door assembly should be located toward
the front of the fireplace. If the hinge and the handle are
not positioned in this manner, the door will not function
correctly.
•
Attach the door assembly to the fireplace using the
screws provided.
Figure 3.9
NO
Outlet blocked by
snow, leaves, etc.
YES
Clear area
outside
house or in
ventilated
• Use UL181 Class 1 or Class 0 rigid or flexible ducting.
crawl space
• Install with short run or mainly straight duct, except small
dip for cold air trap which will help prevent flow of cold air.
• Secure flex duct with screws or wire ties.
Figure 3.8
Outside Air Installation
Flexible Duct
Flexible Duct
2 Wire Ties
2 Wire Ties
Outside Air Installation
Heatilator • MHST36D Installation Manual • 4012-086 • Rev D • 03/17
NO
Garage or
NO
combustible
liquids storage
Attic space
Factory-built
fireplace
•
Check operation by pulling the handle out to open and
pushing it in to close.
•
Mark and cut out a 6 1/2 in. (165 mm) hole in the building
side for air entry. This hole should allow some framing
(two sides) so the 6 in. (152 mm) diameter inlet tube
assembly may be fastened properly.
•
Assemble flexible duct (not supplied) between the door
assembly and the inlet tube assembly. Secure it in
position with the supplied wire ties.
•
Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
•
Seal between the outside air inlet hood and the house
with silicone to prevent air infiltration.
Outside Air
Plate
Assembly
NO
Outlet placed
higher than 3 ft
below the
termination cap
13
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