Vermont Castings BC36MH Installation & Operating Manual page 10

BC36MH, BC42MH Woodburning Fireplace
Pipe Section
Fig. 12 Install pipe, listening for the snap-lock to fasten.
Cut and Frame Roof Hole
This step must be completed while on the roof of the
mobile home. It is good practice to use plywood as
weight support while on the roof.
Cut a 14Z⁄₂" x 14Z⁄₂" (368 x 368 mm) hole in the roof.
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There must be a 1Z⁄₂" (38 mm) air space between out-
Pipe install
ermost portion of chimney sections and any adjacent
Circulating models
combustible surfaces (Fig. 13) (Combustible surfaces
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include burnable materials such as: ceiling members,
joists, flooring, combustible insulation and roof struc-
tures.)
WARNING: Do not pack required air spaces with
insulation or other materials.
Mark an outline of the roof hole around the centerpoint
of the nail. NOTE: Hole dimensions are horizontal
dimensions, therefore, the hole size must be marked on
the roof accordingly.
Cover the opening of the installed chimney so debris
cannot get into the system.
Cut and frame the hole. It is good practice to use fram-
ing lumber that is the same size as the rafters. Install
the frame securely because the chimney top and flash-
ing anchored to the frame must be able to withstand
heavy winds.
Before completing chimney run, you must now install
the Radiant Shield/Firestop.
Installing Radiant Shield/Firestop
CAUTION: The structural integrity of the floor, wall,
ceiling, roof trusses and any other structural mem-
bers must be maintained.
10
Pipe Rim
Hem
Lance
Pipe
Rim
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Air space Clearances
Combustible framing material MUST NOT
penetrate AIR SPACE (shaded areas)
1Z⁄₂"
Z⁄₂" Air Space
to Sides
Front View
Wall
Shield
Only noncombustible material
may be applied as facing to the
black fireplace surround.
Fig. 13 Minimum clearances to combustibles.
The radiant shield/firestop is required for all manufac-
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tured (mobile) home installations. The available radiant
BC36MH
shield/firestop may be used for flat or vaulted home ceil-
AIR SPACES
ings. It must extend through the attic and into the roof
circulating models
flashing.
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If the radiant shield/firestop does not extend through the
attic and into the roof flashing, the TE thimble exten-
sion must be added to extend the shield into the roof
flashing. However, if the attic space is ventilated and
the fireplace system height from floor to the flue outlet
of the termination is 13'6" or more, it is not necessary to
extend the radiant shield into the roof flashing.
The radiant shield/firestop is designed to eliminate the
need to cut trusses when installing the 8" (203 mm)
chimney between standard roof trusses fabricated on
16" (406 mm) centers. Locate and mark the center of
Standoff
Side View
Radiant Shield/
Firestop
Z⁄₂" (13mm)
Air Space
to Back
Z
⁄₂" (13mm)
Air Space
to Sides
0" Clearance
to Floor
Hearth Extension
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