Vermont Castings BC36MH Installation & Operating Manual page 9

Installing Outside Air System
It is necessary to install outside air in your mobile home
fireplace. Through this system, outside air is drawn into
the fireplace where it supplies the air for combustion.
The Outside Air Kit is shipped with the fireplace. A 48"
(1219 mm) flexible duct section is provided with each
unit.
All Vermont Castings Group mobile home approved
fireplaces use 6" (159 mm) outside air duct systems.
Planning the Installation
Plan the location of the duct termination (purchased
separately) of the Outside Air System, and the path of
the interconnecting duct.
Duct run must be limited to a maximum distance of 20'
(3 m) from the fireplace pipe collar to duct termination.
This will provide the least restriction to air flow. No more
than two 90° elbows can be used. Duct run may be
horizontal, vertical inclined downward or upward, or any
combination of these. Upward vertical duct runs must
be limited in height to one (1) foot above the fireplace
before being run horizontally and terminated out-of-
doors. (Fig. 11)
The duct termination should be located so it is exposed
to an out-of-doors ventilation opening of at least 100
square inches. If the duct termination is located below
the mobile home, be sure the termination area has the
same size ventilation opening.
Duct
Termination
Fireplace
Duct
Duct
Run
Floor
Duct Termination
Fig. 11 Typical duct installations.
7412972
Duct
Run
Exterior
Wall
Fireplace
MH100
Duct install
mobile home
5/28/99 djt
BC36MH, BC42MH Woodburning Fireplace
The duct termination must be located so it does not
compete for air flow with exhaust fans, gas vent hoods
or other air consuming devices or appliances. It must
not be blocked by rafters, insulation materials, shrubs or
drifting snow.
CAUTION: Do not install termination into a garage
or other area that could contain flammable liquids
or fumes, or into an attic space.
Install the flex duct to connect the fireplace collar on left
side of fireplace and the termination. Be sure to fol-
low planning guidelines detailed above. Flexible duct,
straight smooth duct and elbows, or a combination of
the two may be used. Secure each duct joint with three
equally spaced sheet metal screws.
Use Class 1 duct material between pipe collar and duct
termination.
Secure the duct run using three sheet metal screws at
each joint. These screws are not provided.
The outside air termination(s) should be supported in
a convenient manner and in a position where it cannot
become clogged with dirt or insulation.
Locate the centerpoint of the wall or floor and draw an
oversized circle exceeding the duct diameter for each
penetration. Cut the marked hole. Put a bead of caulk-
ing around the hole(s), install the termination and attach
with small screws or nails.
Installing the Chimney System
Start by attaching the first chimney section to the collar
on top of the fireplace.
Install the pipe as pictured in Figure 12. When you get a
good lock, you will hear the pipe clearly snap together.
Once sections are snap-locked in place, it is extremely
difficult to get them apart. Make sure the pipe is firmly
Duct
snapped and locked together as each pipe section is
mounted.
Continue installing the pipe as required until pipe is
installed up to the ceiling/roof opening.
MH100
Run pipe to roofline. Since chimney system must be
vented to the out-of-doors, you must use an approved
Vermont Castings Group termination.
Locate Chimney Centerpoint On Roof
Use same procedure detailed in locating centerpoint
of the flue system. Drive nail up through roof at the
centerpoint. This will determine centerpoint on outside
of the roof.
Installation
Install the Termination
Penetrating the Roof
9