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Vertical Termination - Rigid Vent
Systems
Note: A clearance of 2"(51mm) must be
maintained; except when passing
through a wall, ceiling, or at the
termination where the use of a
firestop or wall thimble reduces
the required clearance to 1-1/2"
(38mm). We recommend framing
a 11"(279mm) x 11"(279mm)
(inside dimensions) hole to give
structural rigidity for mounting the
termination.
1) Maintain the 1-1/2" (38mm) c l e a r a n c e s
( a i r
s p a c e s )
t o
c o m b u s t i b l e s w h e n
passing through ceilings,
walls, roofs, enclosures,
attic rafter, or other nearby
combustible surfaces,
ensuring that the use of
a firestop or wall thimble
is used as noted above.
Do not pack air spaces
with insulation. Check
"Venting Arrangement
- Ver tical Termination"
section 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 his 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.
Determine if ceiling joists,
roof rafters or other framing
will obstruct the venting
system. You may wish to
relocate the appliance or
to offset, as shown in Diagram 2 to avoid cutting
load bearing members.
3) A Firestop spacer must be installed in the floor
or ceiling of every level.
Diagram 3
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
Note:
For best results and optimum performance
with each approved venting system, it is highly
recommended to apply "Mill-Pac" sealant to
every inner pipe connection. Failure to do so
may result in drafting or performance issues
not covered under warranty.
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 4.
Diagram 1
Diagram 4: The upper half of the flashing is
plumber's
installed under the roofing material and not nailed
tape
connected
down until the chimney is installed. This allows
to wall strap
for small adjustments.
wall
o
45
strap
Elbows
6) Continue to assemble pipe lengths.
Firestop
Spacer
Note: If an offset is necessary in the attic
to avoid obstructions, it is important
Diagram 2
to support the vent pipe every 3
feet (0.9 meter), to avoid excessive
stress on the elbows, and possible
separation. Wall straps are available
for this purpose
(Diagram 2).
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 Diagram 5 or local codes.
Note that for steep roof pitches, the vertical height
must be increased.
Ruban de
plombier
relié à
l'attache
murale
Attache
murale
Coudes de 45
walstrp.eps
walstrpf.eps
o
french
Diagram 5
Roof Pitch
flat to 7/12
over 7/12 to 8/12
over 8/12 to 9/12
over 9/12 to 10/12
over 10/12 to 11/12
over 11/12 to 12/12
over 12/12 to 14/12
over 14/12 to 16/12
over 16/12 to 18/12
over 18/12 to 20/12
over 20/12 to 21/12
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.
Offset Chart
Regency Horizon ® HZ54E-11 Gas Fireplace
installation
Minimum Vent
Height
Feet
Meters
2
0.61
2
0.61
2
0.61
2.5
0.76
3.25
0.99
4
1.22
5
1.52
6
1.83
7
2.13
7.5
2.29
8
2.44
37
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