Combustion Air Assembly - MHSC B-Vent 400BBVPV Installation & Operating Instructions Manual

COMBUSTION AIR ASSEMBLY

MODEL OAC-4 COMBUSTION AIR ASSEM-
BLY
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 fire-
place. Fireplace shortest side of air starting collar
through fireplace outer wrap. Fasten starting collar in
place with four (4) sheet metal screws provided. Fig-
ure 12
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 fire-
place wall.
3. Cut a 6" diameter opening for model OAC-4 in the
outside wall covering where the outside vent is to be
located. Figure 14
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.
Figure 13
Left Side of
Fireplace
FP2023
Figure 12 -
Attach Outside Air Starting Collar to Left Side of
Fireplace
5. If using insulating duct, push the insulation back from
one end of the duct approximately 2". Figure 14
6. Slip the exposed end of the duct over the starting col-
lar 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.
62D4037
OAC-4
Starting
Collar
Shorter End of Air
Starting Collar
BBV, SBV Series Natural Vent Gas Fireplaces
DO NOT remove the cover if the outside
air will not be connected.
Do not use a combustible duct. Always use
UL Listed Class 0 or 1 duct material. If nec-
essary to splice duct, use Model 403 duct
connector to splice duct sections.
FP2024
Figure 13 -
Attach Outside duct to Starting Collar
Sheet Metal
Screws
6" Diameter
Hole
Duct Ex-
tending 3"
Min.
FP2025
Figure 14 -
Combustion Air Assembly for Model No. OAC-4
Air Starting Collar
Screws
Screws
Left Side of
Fireplace
AK-4 Inlet Air
Vent
Duct
Nail
Hole
Screws
13