Outside Air - Vermont Castings BC36MH Installation & Operating Manual

the ceiling at the ceiling level. For flat ceilings, cut a 14Z⁄
₂" (368 mm) square in the ceiling. For vaulted ceilings, a
larger cutout is needed to provide sufficient clearance.
The width of the cutout will still be 14Z⁄₂" (368 mm), but
the length should be increased in order to maintain
proper clearances from the chimney components to
combustibles. Sealing of the space between the firestop
base plate and firestop is not required. Position the
with the flanges up and with the cylindrical portion ex-
tending up into the hole. Nail the radiant shield/firestop
securely to the framing. The firestop has a 10" (254
mm) long sleeve that functions as an insulation/heat
Nails
Screw
Roof
Pitch Tab
Roof
Pitch Tabs
Ceiling Level
Fig. 14 Radiant Shield/Firestop into ceiling and through roof.
Radiant Shield/Firestop
TE Thimble Extension may be re-
quired for pitched roof installation.
Fig. 16 Manufactured housing installations.
7412972
Remove
Combustible
Roof Mate-
rial
Roof
Radiant Shield/
Firestop
Radiant
Shield/
Firestop
MH102
Flat Roof
MH102
Roof
Radiant Shield
install
7/7/99 djt
Minimum System Height:
11'6" (3.5 m)
BC36MH, BC42MH Woodburning Fireplace
shield. The thimble extension slips into the radiant
shield and is fastened to the shield with sheet metal
screws. A model 8-6-12 roof flashing, storm collar, and
the RLTSK8 termination cap are required to complete
the installation.
NOTE: When clearances are a concern for home
transportation to site, the last piece of vent pipe and
termination cap may be installed at destination.
Fig. 15 Nail Radiant Shield/Firestop to framing members.
Termination
Storm Collar
Flashing
Universal Firestop
Thimble
Minimum System Height:
11'6" (3.5 m)
T252

outside air

Radiant Shield/
Firestop
Ceiling
Nails
MH104
Radiant Shield
Framing
6/2/99 djt
Pitched Roof
Roof
*
May be required.
Framing
Member
MH104
Termination
Storm Collar
Flashing
Thimble
*
Extension
Universal
Firestop
Thimble
T252
11