22
53D9025
OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
NOTE:
The use of outside air for combustion is optional unless required by building codes. It is
only necessary to supply outside combustion air to one side of the fireplace. Use the Model AK4
combustion air kit.
������
���������������
����
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
Secure Outside Air Starting Collar to Fireplace
Figure 21
Step 1:
Secure outside air starting collar to left side of fire-
place with four (4) sheet metal screws provided.
NOTE:
The starting collar extends through the outer fireplace
jacket and will seal against the firebox wall when secured as
indicated.
������
�������������������
����
Step 2:
Secure outside duct to starting
collar with duct clamp or screws
.
Fireplace Outer Wrap
AK4 Combustion Air
Kit (Shortest Toward
Firebox)
AK4 Mounting Plate
Firebox Insulation Seal
�������
��������������
����
Second Floor
Firestop Spacer
Duct Extended
to Miss Joint
To Outside Wall
Installation Above Basement
or Crawl Space
8‘ Max.
FP1903
OA soffit install
8/08
Firestop
Spacer
CAUTION:
Do not take
combustion air from at-
tic space or garage.
Concrete Slab Installation
(Optional Outside Air Runs)
Inlet Grille in
Soffit
(Overhang)
Termination Cap
