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Diagram 8
3. To install the Round Support Box/Wall Thimble
in a flat ceiling, cut a 10 inch square hole in
the ceiling centred on the hole drilled in Step
2. Frame the hole as shown in Diagram 9.
Diagram 9
4. Assemble the desired lengths of black pipe and
elbows necessary to reach from the appliance
adapter up though the Round Support Box.
Insure that all pipes and elbow connections are
in the fully twist-locked position and sealed.
5. Cut a hole in the roof centred on the small
drilled hole placed in the roof in Step 2. The
hole should be of sufficient size to meet the
minimum requirements for clearance to com-
bustibles of 1-1/2". Slip the flashing under
the shingles (shingles should overlap half the
flashing) as per Diagram 10.
NOTE:
For best results and optimum perfor-
mance with each approved venting sys-
tem, it is highly recommended to apply
"Mill-Pac" sealant (supplied) to every
inner pipe connection. Failure to do so
may result in drafting or performance
issues not covered under warranty.
6. Continue to assemble pipe lengths.
Note: 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 avail-
able for this purpose. See Diagram
5.
Diagram 10
The upper half of the flashing is installed
under the roofing material and not nailed
down until the chimney is installed. This
allows for small adjustments.
Galvanized pipe and elbows may be utilized
in the attic as well as above the roofline. The
galvanized finish is desirable above the roofline
due to its higher corrosion resistance.
Continue to add pipe sections through the
flashing until the height of the vent cap meets
the minimum height requirements specified
in Diagram 11 or local codes. Note that for
steep roof pitches, the vertical height must be
increased. A poor draft, or down drafting can
result from high wind conditions near big trees
or adjoining roof lines, in these cases, increasing
the vent height may solve the problem.
Diagram 11
Roof Pitch
Minimum Vent Height
Feet
flat to 7/12
2
over 7/12 to 8/12
2
over 8/12 to 9/12
2
over 9/12 to 10/12
2.5
over 10/12 to 11/12
3.25
over 11/12 to 12/12
4
over 12/12 to 14/12
5
over 14/12 to 16/12
6
over 16/12 to 18/12
7
over 18/12 to 20/12
7.5
over 20/12 to 21/12
8
7. Ensure vent is vertical and secure the base
of the flashing to the roof with roofing rails,
slide storm collar over the pipe section and
seal with a mastic.
8. Install the vertical termination cap by twist
locking it.
Notes:
a) For multi-storey vertical installations, a
Ceiling Fire stop is required at the second
floor, and any subsequent floor. Diagram
12. The opening should be framed to 10
" x 10" inside dimensions, in the same
manner as shown in Diagram 9.
b) Any occupied areas above the first floor,
including closets and storage spaces,
through which the vertical vent passes,
must be enclosed.
2
Diagram 12
Offset Chart
Meters
0.61
0.61
0.61
0.76
0.99
1.22
1.52
1.83
2.13
2.29
2.44
installation
2
2
2
RC500EX |
43
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