HAMPTON BAY H35-NG2 Owners & Installation Manual page 25

INSTALLATION
Diagram 8
3) To install the Round Support Box/Wall Thim-
ble in a fl at 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 adaptor up though the Round
Support Box. Insure that all pipes and elbow
connections are in the fully twist-locked
position and sealed.
NOTE: For best results and optimum per-
formance 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
performance 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 suffi cient size to meet
the minimum requirements for clearance
to combustibles of 1-1/4". Slip the fl ashing
under the shingles (shingles should overlap
half the fl ashing) as per Diagram 10.
24
Diagram 10: The upper half of the fl ashing is
installed under the roofi ng 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 roof line. The
galvanized fi nish is desirable above the roof
line due to its higher corrosion resistance.
Continue to add pipe sections through the
fl ashing until the height of the vent cap meets
the minimum height requirements specifi ed
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
fl at 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 fl ashing to the roof with roofi ng 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 (Part # 46DVA-FS) is
required at the second fl oor, and any
subsequent fl oor. Diagram 12.
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 fi rst fl oor,
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 H35-2 Direct Vent Freestanding Gas Stove
The