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MPL11 Woodburning Fireplace

87D0173

outside combustion air recommendations

(continued)

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 and 25

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 ac-

cidentally blocked in any manner. The assembly should be located above the snow line to prevent
blockage by snow accumulation.

3. The combustion air inlet assembly should never be mounted in a garage or storage area where com-

bustible 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 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 be-
yond 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 pro-

vided, 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 fas-
teners. Mount the combustion air as-
sembly 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.

outSide coMbuStioN air

FP1900
OA start collar
8/08

Insulation Ring

Insert Shortest Side of the
Tube through the Fireplace
Outer Wrap to Properly
Seal Against Firebox Wall
and Gasket

Longer Length of the
Tube to Outside

Figure 21

FP1900

FP1901
secure outside duct
8/08

Fireplace Outer Wrap

AK4 Combustion Air
Kit (Shortest Toward
Firebox)

AK4 Mounting
Plate

Firebox Insulation
Seal