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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.
Diagram 9
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 combustibles
of 1-1/4". Slip the flashing under the shingles
(shingles should overlap half the flashing) as
per diagram 10.
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
available 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
Note: For best results and optimum perform-
ance 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.
Silicone (red RTV) is optional.
Hampton® H15U-NG/LP Direct Vent Freestanding Gas Stove
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 lock-
ing it.
Notes:
a) For multistorey vertical installations, a
Ceiling Fire stop (Part # 963) 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.
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
Diagram 12
31
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