Heat & Glo MISSION-BAY Owner's Manual page 17

Step 9.
Twist-lock the vent cap and seal.
Note: For multi-story vertical installations, a ceiling firestop
is required at the second floor, and any subsequent floors
(Figure 5.16). The opening should be framed to 10 in. x
10 in. (254mm x 254mm) inside dimensions, in the same
manner as shown in Figure 5.13, on page 16.
CEILING FIRES TOP
MIN. 1 in. (25mm)
CLEARANCE
MIN. 1 in. (25mm)
CLEARANCE
Figure 5.16
Fire Risk.
Explosion Risk.
• Any occupied areas above the first floor, including
closets and storage spaces, which the vertical
vent passed through must be enclosed. The
enclosure may be framed and sheetrocked with
standard construction materials; however, refer
to these 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 of the required air space
with insulation.
July 12, 2006
NAILS
MIN. 1 in. (25mm)
CLEARANCE
MIN. 1 in. (25mm)
CLEARANCE
WARNING
Heat & Glo · Mission Bay · 250-7512F
2. Cathedral Ceiling
Step 1.
Follow installation Steps 1 and 2 under vertical installation
section, pages 14-15.
Step 2.
Remove shingles or other roof covering as necessary to cut
the rectangular hole for the support box. Cut the hole 1/8 in.
(3mm) larger than the support box outline.
Step 3.
Lower the support box through the hole in the roof until the
bottom of the support box protrudes at least 2 in. (51mm)
below the ceiling (Figure 5.17). Align the support box both
vertically and horizontally with a level. Temporarily tack the
support box in place through the inside walls and into the
roof sheathing.
CUT HOLE 1/8 in.
(3mm) GREATER IN
SIZE THAN PATTERN
OF SUPPORT BOX AS
IT IS PROJECTED
ONTO ROOF LINE
Figure 5.17
Step 4.
Using tin snips, cut the support box from the top corners
down to the roofline, and fold the resulting flaps over the roof
sheathing (Figure 5.18, on the next page). Before nailing it
to the roof, run a bead of non-hardening mastic around the
top edges of the support box to make a seal between it and
the roof. Clean out any combustible material from inside
the support box.
Step 5.
Assemble the desired lengths of pipe and elbows necessary
to reach from the appliance up through the round support
box. Ensure that all pipe and elbow connections are in their
fully twist-locked position. Assemble as instructed.
LEVEL
CATHEDRAL CEILING
SUPPORT BOX
2 in. (51mm)
MIN. BELOW
FINISHED
CEILING
Page 17