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Dura-Vent 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" Sec-
tions for the maximum vertical rise of the venting
system and the maximum horizontal ofset
limitations.
2. Set the gas appliance in its desired location.
Drop a plumb bob down from
the ceiling to the position of
the appliance lue 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 loor or
ceiling of every level. To
install the Firestop spacer
in a lat ceiling or wall, cut a
10 inch square hole. Frame the hole as shown
in Diagram 2 and install the irestop.
Note: All vertical terminations are vented
using 4" x 6-5/8" venting and rigid pipe
adaptor #510-994.
Diagram 2
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 connection. 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 suficient size to meet the minimum
requirements for clearance to combustibles
of 1-1/2". Slip the lashing under the shingles
(shingles should overlap half the lashing) as
per Diagram 3.
Diagram 1
Diagram 3: The upper half of the lashing is installed
under the rooing 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.
Wall straps are available for this
purpose.
Galvanized pipe is desirable above the rooline
due to its higher corrosion resistance. Continue
to add pipe sections through the lashing until the
height of the vent cap meets the minimum height
requirements speciied 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 vent height may solve
the problem.
Diagram 3
adjustments.
installation
Diagram 4
Roof Pitch
Minimum Vent Height
Feet
lat 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 lashing to the roof with rooing 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.
City Series |
Meters
0.61
0.61
0.61
0.76
0.99
1.22
1.52
1.83
2.13
2.29
2.44
57
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