Monessen Hearth Natural Vent Gas Fireplace SBV400 - Manual (Page 17)

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COMBUSTION AIR ASSEMBLY
MODEL OAC-4 COMBUSTION AIR ASSEMBLY
1. Remove the cover plate from the 4" outlet opening location on the left outside
of the fireplace.
2. Place starting collar (4") into hole on left side of fireplace. Fireplace shortest
side of air starting collar through fireplace outer wrap. Fasten starting collar
in place with four (4) sheet metal screws provided. See Figure 13.
Note: The air starting collar extends through the fireplace outer wrap. When the air starting collar is
securely attached, it will form a seal against the fireplace wall.
3. Cut a 6" diameter opening for model OAC-4 in the outside
wall covering where the outside vent is to be located. See
Figure 15.
4. Select and cut a piece of duct long enough to attach to the
fireplace and stick out at least 3" beyond the face of the
wall to which the OAC-4 inlet air vent will be attached.
Cut duct with a standard pocket knife. See Figure 14.
DO NOT remove the
cover if the outside air
will not be connected.
W
ARNING
Figure 13 - Attaching Outside Air
Starting Collar to Left Side of Fireplace
Figure 14 - Attaching Outside Duct
to Starting Collar
OAC-4
Starting
Collar
Sheet
Metal
Screws
Left Side of
Fireplace
Shorter End of Air
Starting Collar
Air Starting
Collar
Duct
Screws
Left Side of
Fireplace
Figure 15 - Combustion Air Assembly for
Model No. OAC-4
Nail
Holes
6" Diameter
Hole
Duct
Extending
3"min.
AK-4 Inlet
Air Vent
Screw
Screws
5. If using insulating duct, push the insulation back from
one end of the duct approximately 2". See Figure 15.
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 sur-
face of the wall.
Do not use a combustible duct. Always
use UL Listed Class 0 or 1 duct
material. If necessary to splice duct,
use Model 403 duct connector to splice
duct sections.
W
ARNING