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

BBV, SBV Series Natural Vent Gas Fireplaces
NOTE: The use of outside air for combus-
tion is optional unless required by building
codes. It is only necessary to supply outside
combustion air to one side of fireplace. Use
model OAC4 combustion air kit (refer to Page
17).
1. Avoid extremely long runs and numer-
ous turns in duct leading from fireplace
to combustion air assembly. These condi-
tions increase the resistance to free flow
of air through duct. Figures 10 and 11
2. Locate combustion air assembly at an
exterior location. Make sure the location
cannot be accidentally blocked. Locate
assembly above snow line to prevent
snow from blocking assembly.
3. Never mount combustion air inlet assem-
bly in garage or storage area where com-
bustible fumes (gasoline) might be drawn
into fireplace.
4. Combustion air may be drawn from crawl
space under house when adequate sup-
ply of air is provided by open ventilation.
Figure 10
NOTE: Never take combustion air from attic
space or garage space.
NOTE: Install outside combustion air ONLY
ON LEFT-HAND SIDE of fireplace.
12
Duct Extend-
ed to Miss
Joist
To Outside
Wall
Figure 10 -
Install Unit Above Basement or Crawl Space
Inlet Grille
in Soffit
(Overhang)
8" Maximum
Figure 11 -
Install Unit on Concrete Slab with Optional Outside Air Runs

OUTSIDE COMBUSTION AIR

FP2021
FP2022
62D4037