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B36LA8 & B36RA8 Woodburning Fireplaces
Model OAC4 Combustion Air Assembly
1. Remove the cover cap from the 4" outlet opening loca-
tion on the left or right outside surface of the fireplace.
DO NOT REMOVE THE COVER IF THE OUTSIDE
AIR WILL NOT BE CONNECTED.
2. Fasten the 4" starting collar over the hole on the left or
right side of the fireplace with the four (4) sheet metal
screws provided. Figure 24
3. Cut a 6" diameter opening for model OAC4 in the out-
side wall covering where the model OAC4 outside
grille is to be located. Figure 26
Attach Outside Air Starting Col-
lar to Fireplace
Step 1
Attach outside air starting collar to
left or right side of fireplace with four
(4) sheet metal screws provided.
FP2173
Step 2
Attach outside air duct to starting
collar with duct clamp.
Figure 26
6" Dia.
Hole
FP1904
4. Select and cut a piece of duct of sufficient length to
attach to the fireplace and protrude at least 3" beyond
the face of the wall to which the OAC4 inlet air box
assembly 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 2". Figure
27
24
Figure 25
Clamp
Nail
Holes
COMBUSTION AIR ASSEMBLY
Figure 27
1
2
Loop Disengaged
Slip Band
Clamp Around
Through
Duct
Housing
Band
6. Slip the exposed end of the duct over the flange tube
of the fireplace.
7. Place the duct clamp around the exposed end of the
aluminum duct.
8. Slip the band through the housing, then pull the band
tight around the duct.
9. Snap the band locking screw down and tighten it with
a screwdriver or nutdriver. Figure 27
10.Nail or screw the combustion air assembly to the sur-
face of the wall.
NOTE: If the wall covering is brick or stone, use appro-
priate masonry fasteners. Mount the combustion air as-
sembly with "TOP" up to prevent rain from entering the
assembly. Be sure the 6" diameter opening around the air
duct is sealed with insulating material to prevent cold air
from entering through the wall. If it is necessary to splice
the duct, a model 403 duct connector should be installed
as described in Figure 26.
Combustion Air Assy. Model OAC4
Installation of the Model 403 Duct Connector
1. Push the insulation back approximately 2" from the
end of each duct.
2. Slip each duct over the duct connector until an equal
length of the connector extends into each duct.
3. Place a duct clamp over the end of each duct and
tighten it down snugly.
4. Push the insulation back into place and over the duct
clamp.
Duct Connector
Figure 28
FP1907
2"
App.
Screw
3
Snap Screw
Down and
Tighten
FP1906
FP1906
Duct connector
8/08
Approximately
2"
Insulation
Duct Clamp
87D0176
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