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Ceiling Supported Installation
- Position appliance: locate appliance in accordance with the appliance manufacturer's instructions and
Step 1
clearance specifications. Pay particular attention to the outlet flue collar of the appliance and endeavor to
position it between the rafters and joists above.
Step 2
Frame ceiling opening:
use a plumb bob from the ceiling to
the center of the appliance outlet flue
collar and mark this point on the
ceiling above. (Refer to table 1
regarding rough framing dimensions
for each chimney diameter). Mark
the ceiling for proper rough opening
and cut a hole for the appropriate
ceiling support. Frame rough
opening.
Rough Opening Dimensions for:
Flat Ceiling Support, Cathedral Ceiling Support, Roof Opening, Wall Thimble,
Chimney
10"
12"
Diameter
(inside)
Rough
16" x 16"
18" x 18"
Opening
(inside)
Table 1
Firestop Assemblies
8
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