Enviro C-10914 - Manual (Page 22)

(2) Any occupied areas above the first floor, including
closets and storage spaces, which the vertical vent
passes through, must be enclosed. The enclosure
may be framed and sheet rocked with standard
building materials. However consult the appliance
manufactures installation instructions for the minimum allowable clearance between the outside of
the vent pipe, and the combustible surfaces of the enclosure. Do not fill any required air spaces with
insulation.
C
ATHEDRAL
C
EILING
I
NSTALLATION
:
STEP 1. Follow installation steps 1 & 2 under I
NITIAL
I
NSTALLATION
- V
ERTICAL
I
NSTALLATION
.
STEP 2. Using the plumb bob, mark the centerline of the venting system on the ceiling and drill a small
hole through the ceiling and roof at this point. From the roof, locate the drill hole and mark the
outline of the “Cathedral Ceiling Support Box”.
STEP 3. Remove shingles or other roof coverings as necessary to cut the rectangular hole for the
“Support Box”. Cut the hole 1⁄8” larger than the “Support Box” outline.
STEP 4. Lower the “Support Box” through the hole in the roof until the bottom of the “Support Box”
protrudes at least 2 inches (5 cm) below the ceiling. Align the “Support Box” both vertically and
horizontally with a level as shown in Figure 28. Temporarily tack the “Support Box” in the place
through the inside walls and into the roof sheathing.
STEP 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 29). 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”.
Figure 26: Use of Wall Straps.
Figure 27: Multi-Story Vent Pipe Installation.
Initial Installation
QUALIFIED INSTALLERS ONLY
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