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installation
1) Maintain the 1-1/2" (38mm) clearances
(air spaces) to combustibles when passing
through ceilings, walls, roofs, enclosures,
attic rafter, or other nearby combustible
surfaces. Do not pack air spaces with insula-
tion. Check pages 13-17 for the maximum
vertical rise of the flueing system and the
maximum horizontal offset limitations.
2) Set the gas appliance in its desired location.
Drop a plumb bob down from the ceiling to the
position of the appliance flue exit, and mark
the location where the flue will penetrate the
ceiling. Drill a small hole at this point. Next,
drop a plumb bob from the roof to the hole
previously drilled in the ceiling, and mark the
spot where the flue will penetrate the roof.
3) A Firestop spacer must be installed in the
floor or ceiling of every level. To install the
Firestop spacer in a flat ceiling or wall, cut
a 10 inch square hole. Frame the hole as
shown in Diagram 2 and install the firestop.
4) Assemble the desired lengths of pipe and
Diagram 2
22
VERTICAL TERMINATION
elbows. Ensure that all pipes and elbow
connections are in the fully twist-locked
position and sealed.
5) Cut a hole in the roof centered on the small
Note: Apply sealant "Mill-Pac" to inner pipe
and high temperature silicone seal-
ant to outer pipe on every twist-lock
joint.
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 1-1/2" (38mm). Slip the
flashing under the shingles (shingles should
overlap half the flashing) as per Diagram 3.
6) Continue to assemble pipe lengths.
Diagram 1
Diagram 3: 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.
Note: If an offset is necessary in the attic to
avoid obstructions, it is important to
support the flue pipe every 3' (0.9m),
to avoid excessive stress on the el-
bows, and possible separation. Wall
straps are available for this purpose.
Galvanized pipe is desirable above the roofline
due to its higher corrosion resistance. Continue
to add pipe sections through the flashing until
the height of the flue cap meets the minimum
height requirements specified in Dia. 4 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
flue height may solve the problem.
7) Ensure flue 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-
Diagram 4
Roof Pitch
Minimum Flue 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
locking it.
Note: Any closets or storage spaces, which the
flue passes through must be enclosed.
Regency PG33NG4-R Gas Inbuilt
Meters
0.61
0.61
0.61
0.76
0.99
1.22
1.52
1.83
2.13
2.29
2.44
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