Quadra-Fire TOPAZ-MBK-IPI Installation Manual page 39

Install Decorative Ceiling Components
A decorative ceiling thimble can be installed on a flat ceiling
through which the vent passes. The decorative ceiling
thimble is used to cover the firestop.
• Seal the gap between the vent pipe and firestop using
high temperature silicone (300º F minimum continuous
exposure rating) to prevent cold air infiltration.
• Install the decorative ceiling thimble by sliding it up to the
ceiling and attaching it using the provided screws.
A decorative cathedral ceiling support box can be installed
on a cathedral ceiling through which the vent passes.
• Use a plumb-bob to mark the center line of the venting
system on the ceiling and drill a small hole through the
ceiling and roof at this point. Locate the hole and mark the
outline of the cathedral ceiling support box on the outside
roof.
• Remove shingles or other roof covering as necessary to
cut the rectangular hole for the support box. Cut the hole
1/8 in. (3 mm) larger than the support box outline.
• Lower the support box through the hole in the roof until its
bottom is at least 2 in. (51 mm) below the ceiling (Figure
7.9).
• Level the support box both vertically and horizontally and
temporarily tack it in place through the inside walls into
the roof sheathing.
• Use tin snips to cut the support box from the top corners
down to the roof line and fold the resulting flaps to the
roof. See Figure 7.10.
• Nail the flaps to the roof AFTER running a bead of non
hardening sealant between the flaps and the roof.
WARNING! Risk of Fire! Clean out ALL materials from
inside the support box and complete the vertical vent run
and termination.
CUT HOLE 1/8 in. (3 mm)
GREATER IN SIZE THAN
PATTERN OF SUPPORT
BOX AS IT IS PROJECTED
ONTO ROOF LINE
Figure 7.9
39 Quadra-Fire • TOPAZ-MBK-IPI, TOPAZ-D-PMH-IPI, TOPAZ-D-MBK-IPI, TOPAZ-D-CSB-IPI Installation Manual • 2341-980_R10 • 11/15
LEVEL
CATHEDRAL CEILING
SUPPORT BOX
2 in. (51 mm) MIN. BELOW
FINISHED CEILING
Figure 7.10