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Figure 42: Cathedral Ceiling Support Box
Installation.
Initial Installation
QUALIFIED INSTALLERS ONLY
Figure 43: Corner installation rear vented with
snorkel.
Figure 44: Corner installation top vented.
CORNER INSTALLATIONS:
Do not interfere with the structural integrity of the walls.
For installations with a 36” (915 mm) snorkel refer to Figure 43 and INITIAL INSTALLATION - VENT CONFIGURATIONS
AND RESTRICTOR SETTINGS. For other corner installations refer to Figure 44 and INITIAL INSTALLATION - VENT
CONFIGURATIONS AND RESTRICTOR SETTINGS.
Also refer to INITIAL INSTALLATION - CLEARANCES TO COMBUSTIBLES.
5. Using tin snips, cut the “Support Box” from the top corners
down to the roof line, and fold the resulting aps over the
roof sheathing (Figure 42). Before nailing it in to the roof,
run a bead of non-hardening mastic around the top edges
of the “Support Box”, to make a seal between the box and
the roof. Clean out any combustible material from the
inside of the “Support Box”.
6. Complete the cathedral ceiling installation by following the
same procedures outlined in Steps 4 through 9 for INITIAL
INSTALLATION - VERTICAL INSTALLATION.
Inside Wall
Outside
Wall
36” (915mm)
Snorkel
2
1
/
2
”
(64mm)
Outside
Wall
Outside
Wall
2
1
/
2
”
(64mm)
26