Enviro C-11290 Initial Installation, Qualified Installers Only, Cathedral Ceiling Support Box

Initial Installation

QUALIFIED INSTALLERS ONLY

5.Using tin snips, cut the “Support Box” from the top corners down to the roof line, and fold the resulting flaps over the roof sheathing (Figure 36). 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.

Figure 36: Cathedral Ceiling Support Box

Installation.

Corner Installations:

Do not interfere with the structural integrity of the walls.

When rear venting if a 90° bend is used the maximum horizontal vent that can be used is 6” (152mm) and if a 45° bend is used the maximum horizontal vent that can be used is 12” (305mm). For installations

with a 36” (915 mm) snorkel refer to Figure 37 and Initial Installation - Vent Configurations and Restrictor

Settings. For other corner installations refer to Figure 38 and Initial Installation - Vent Configurations and

Restrictor Settings.

Figure 37: Corner installation rear vented with	Figure 38: Corner installation top vented.
snorkel.

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