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installation
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 posi-
tion and sealed.
NOTE: For best results and optimum perfor-
mance with each approved venting
system, it is highly recommended to
apply "Mill-Pac" sealant (supplied) to
every inner pipe connection. Failure
to do so may result in drafting or per-
formance issues not covered under
warranty. Silicone (red RTV) is optional.
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.
30
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.
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.
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 multistorey 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.
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
Hampton
®
H27U-NG/H27U-LP Direct Vent Freestanding Gas Stove
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