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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
of non-hardening sealant around the support box to make
a seal between the support box and the roof. Clean out any
combustible material from inside the support box.
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.
Figure 41
Step 8. Follow Steps 7 through 10 of the Vertical Installation
ST993
instructions
flaps
8/07
Step 9. Install the black trim collar around the outside of the
Cathedral ceiling support box. The two pieces of the trim
collar slide over one another to allow for easy adjustment
around the support box. Using the six (6) screws provided,
secure the four corners and the overlapping sections of
the trim collar to the underside of ceiling. You may want
to predrill the holes for the overlapped sections for ease of
installation. (Figure 42)
Cathedral
Ceiling Support
Box
Figure 42
General Maintenance
ST994
Conduct an inspection of the venting system annually.
trim collar
Recommended areas to inspect are as follows:
8/07
1. Check areas of the venting system which are exposed
to the elements for corrosion. These will appear as rust
spots or streaks, and in extreme cases, holes. These
components should be immediately replaced.
22
Ceiling Trim
Overlap
Screws
2. Remove the vertical terminations cap and shine a
flashlight down the vent. Remove any bird nests, or other
foreign material.
3. Check for evidence of excessive condensation, such as
water droplets forming in the inner liner, and subsequently
dripping out at joints. Continuous condensate can cause
corrosion of caps, pipe and fittings. It may be caused
by having excessive lateral runs, too many elbow and
exterior portions of the system being exposed to cold
weather.
4. Inspect joints to verify that no pipe sections or fittings
have been disturbed or loosened. Also check mechanical
supports such as wall straps or plumbers tape for rigidity.
Supplemental Canadian Instructions
When installing DirectVent Pro on appliances in Canada,
a 2-piece decorative wall thimble is required in order to
comply with IR #41. (Figure 18 and 20) Install galvanized
exterior wall thimble plate on exterior of building and black
decorative wall thimble plate on the interior side of wall. Install
wall thimble centered through a square framed opening in
wall. Be sure to maintain all minimum clearances. When
installing DirectVent Pro vertically through floors, a ceiling
firestop is required at every floor/ceiling level.
Vertical Through Existing Chimney
The heater must be vented to the outdoors through an
existing masonry or prefabricated fireplace chimney system
through the roof.
The heater is approved to be vented to the outdoors through
any solid-fuel fireplace chimney that has been constructed or
installed in accordance with the national, Provincial/State and
local building codes and is constructed of noncombustible
materials. For Venting Requirements, refer to Page 10. Refer
to Venting Components on Page 14.
Converting a Class-A Metal Chimney or Masonry Chimney
to a Direct Vent System
Application
These instructions apply to the DuraVent Direct Vent
Conversion kits for factory-built Class-A metal chimneys and
masonry chimneys. These venting systems, in combination
with the gas appliance, have been tested and listed by a major
testing agency such as UL, AGA, Omni or Warnock Hersey.
Check the manufacturer's rating plate and instruction manual
to confirm that a DuraVent Direct Vent Chimney Conversion
system is approved for use on the brand name appliance
you have selected.
IMPORTANT
Read all instructions carefully before starting the
installation. Failure to follow these instructions
may create a fire or other safety hazard, and will
void the warranty. Be sure to check the appliance
manufacturer's installation instructions for specific
venting and clearance to combustible requirements,
which may vary from one appliance to another.
20012761
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