27
Step 5
. Cut a hole in the roof centered on the small drill hole placed in the roof in Step 2. The hole should be
of sufficient size to meet the minimum requirements for clearance to combustibles, as specified earlier.
Continue to assemble lengths of Pipe and Elbows necessary to reach from the Ceiling Firestop up through
the roof line.
Notes:
(1) If an offset is necessary in the attic
to avoid obstructions, it is important
to support the vent pipe every 3
feet, to avoid excessive stress on
the Elbows, and possible separation.
Wall Straps are available for this
purpose (see Figure 41).
(2) Whenever possible, use 45° Elbows,
instead of 90° Elbows. The 45°
Elbow offers less restriction to the
flow of flue gases and intake air.
Step 6
. Slip the flashing over the
Pipe Section(s) protruding
through the roof. Use a non-
hardening sealant between
the Flashing and the roof to
prevent water leakage. Secure
the base of the Flashing to the
roof with roofing nails. Ensure
the roofing material overlaps
the top edge of the Flashing
as shown in Figure 42. Verify that you have at least the
minimum clearance to combustibles at the roofline.
Step 7
. Continue to add Pipe Sections until the height of the
Vent Cap meets the minimum building code requirements
described by your local codes. In the absence of local
codes, make sure the terminal is 2 feet (610mm) above
anything within 10 feet (3046mm) of the vent (refer to
Figure 44 & Table 5 for clearances for different pitches).
Note that for steep roof pitches, the vent height must
be increased. In high wind conditions, nearby trees,
adjoining rooflines, steep pitched roofs, and other similar
factors can result in poor draft, or down-drafting. In these
cases, increasing the vent height may solve this problem.
Step 8
. Slip the Storm Collar over the Pipe, and push it down to
the top of the Flashing, as shown in Figure 42. Use the
non-hardening sealant above and below the joint between
the Storm Collar and the Pipe.
Step 9
. Twist lock the Vent Cap.
Notes:
(1) For multi-story vertical installations, a Ceiling Firestop is required
at any subsequent floors (as shown in Figure 43). The opening
should be cut and framed in the same manner as the opening in
Step 3 (see Figure 40).
(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 construction
materials, however minimum allowable clearances between the outside of the vent pipe must be maintained.
Do not fill any of the required air spaces with insulation.
Figure 42: Installation of Flashing & Vertical Termination.
I
NSTALLATION
S
ET
-U
P
Figure 43: Installation of Ceiling Fire Stops.
Summary of Contents for DV48
Page 52: ...WIRING HARNESS 52 ...
Page 57: ...PARTS DIAGRAM 57 ...
