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installation
DuraVent Vertical Termination
- 4" X 6-5/8" Venting (Rigid
Vent Systems)
1. Maintain the 1-1/2" 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 insulation. Check "Venting"
Sections for the maximum vertical rise of the
venting 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
vent 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 vent 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.
Note: All vertical terminations are
vented using 4" x 6-5/8" venting and
rigid pipe adaptor #510-994.
Diagram 2
| City Series CV40E-12
52
4. Assemble the desired lengths of pipe and
elbows. Ensure that all pipes and elbow con-
nections are in the fully twist-locked position
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 connec-
tion. Failure to do so may result in drafting
or performance issues not covered under
warranty.
5. Cut a hole in the roof centered 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
1-1/2". Slip the flashing under the shingles
(shingles should overlap half the flashing) as
per Diagram 3.
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
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.
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 vent 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.
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 3
adjustments.
Wall straps are
A poor
Diagram 4
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.
Note: Any closets or storage spaces,
which the vent passes through
must be enclosed.
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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