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Intrepid® Direct Vent - Rear Vent Gas Heater
Consult these
installation
instructions for the
minimum allowable
clearances between
the outside of the
vent pipe and the
combustible surfaces
of the enclosure.
Do not fill required
air spaces with
insulation.
3. If venting system
passes through
an attic space an
attic insulation
shield must be
installed to prevent
contact between
pipe sections and
the insulation.
Nail the base to
floor of attic and
adjust shield
for appropriate
insulation level,
then attach the
Figure 38
collar at the top
of assembly. (Figure 39) For vaulted ceilings, the attic
insulation shield cannot be installed. To prevent building
insulation and other debris from entering the support
box or contacting the pipe, a chase enclosure can be
constructed around the support box. Ensure proper
clearance to combustibles are maintained.
Cathedral Ceiling Installation
Step 1. Follow installation Step 1 and 2 under Vertical
Termination.
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 covering as
necessary to cut the rectangular hole for the support box.
Cut the hole 1/8" (3 mm) larger than the support box outline.
Step 4. Lower the support box through the hole in the roof
until each side of the bottom of the support box protrudes
at least 2" (51 mm) below the ceiling. (Figure 40) 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.
3-90-20306761
High Wind Vertical
Termination
Storm Collar
Roof Flashing
Optional Low Profile
Termination Cap
Secure Flashing with
Non-hardening Sealant
and Roofing Nails
ST990
above roof
8/07
Vermont Castings • Intrepid DV Owner's Manual_R3 • 12/16
Attic Insulation Shield
Required Clearance
Minimum Clearance
Figure 39
ST991
attic insul shield
8/07
Level
Cathedral Ceiling
Support Box
Cut Hole 1/8" Larger
than Support Box
Figure 40
Step 5. Using tin snips, cut the support box from the top
corners down to the roofline, and fold the resulting flaps
over the roof sheathing. The flaps may be trimmed as
needed. (Figure 41) Before nailing it to the roof, run a bead
ST992
of non-hardening sealant around the support box to make
clg support box
a seal between the support box and the roof. Clean out any
combustible material from inside the support box.
8/07
Step 6. Follow Steps 4 and 5 of the Vertical Installation
instructions.
Step 7. Place the support clamp (provided with the support
box) inside the support box (at the bottom), and secure
to the pipe section. The clamp allows the support box to
support the weight of the pipe sections. Continue to add
pipe sections until you are above the roofline.
Nails
Minimum Clearance
Minimum Clearance
2" Min. Below
Finished Ceiling
21
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