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City Series CB40E-12
installation
Diagram 4
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.
Diagram 2
Diagram 3
Dura-Vent Vertical Termina
-
tion - 4" x 6-5/8" (102 mm x
168 mm) Venting (Rigid Vent
Systems)
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 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 ap-
pliance flue exit, and mark the
location where the vent will pen-
etrate 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:
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.
4.
Assemble the desired lengths of pipe and 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
drilled hole placed in the roof in Step 2. The
hole should be of sufficient size to meet the
minimum requirements for clearance to com
-
bustibles 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.
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 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. 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.
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.
Diagram 1
Note: All vertical terminations are
vented using 4" x 6-5/8" (102mm x
168mm) venting and rigid pipe adaptor
#510-994.
Roof Pitch
Minimum Vent Height
Feet
Meters
flat to 7/12
2
0.61
over 7/12 to 8/12
2
0.61
over 8/12 to 9/12
2
0.61
over 9/12 to 10/12
2.5
0.76
over 10/12 to 11/12
3.25
0.99
over 11/12 to 12/12 4
1.22
over 12/12 to 14/12 5
1.52
over 14/12 to 16/12 6
1.83
over 16/12 to 18/12
7
2.13
over 18/12 to 20/12
7.5
2.29
over 20/12 to 21/12 8
2.44
Summary of Contents for CB40E-LP12
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