28
28
2 - 3”
Liners
‘H’
Horizontal
overhang
Vertical
wall
Termination
cap
Storm
collar
Roof
flashing
Plumber’s tape
fixed to wall strap
Wall strap
Ceiling
firestop
Ceiling
support
Offset elbows
Min.
18”
Overhang should
not extend beyond
vent if within 48” of
termination cap
Min. 24”
(unvented soffit)
Min. 36”
(vented soffit)
Roof Pitch
Minimum
‘H’ (feet)
Flat to 7/12
1’
Over 7/12 to 8/12
1.5’
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’
Joists
10”
(254 mm)
10”
(254 mm)
Installations with Vertical Termination—Through the Roof
All Co-Axial Vent Installations
Check the roof pitch to determine which roof
fl
ashing will be needed.
See venting accessories list on pages 39–40 for allowable components.
The distance from the roof to the lowest terminal discharge opening
(“H” in
fi
gure 35) depends on the roof pitch and must be in accordance
with the manufacturer’s instructions supplied with the termination unit.
Note: The venting system for these appliances is considered to be a
Special Venting System. The rule in the Installation Code requiring
a minimum vent height of 2’ above any portion of a building within 10’
does not therefore apply.
The minimum clearances to combustible materials all round the vent
pipes must be in accordance with the dimensions shown in the Location
section of this manual.
Drop a plumb from the ceiling to the center of the appliance vent
opening. Mark the position on the ceiling. Drill a small hole at the
marked position.
Determine the position where the vent will pass through the roof. If
directly above the position where it penetrates the ceiling, drop a plumb
from the roof to the small hole in the ceiling and mark the roof at this
spot.
If rafters or other obstructions will prevent a vertical exit or if clear attic
space is desired, the roof outlet can be offset using 45° elbows. See
fi
gure 35.
Drill a small hole at the marked position.
A ceiling
fi
restop must be installed at the second
fl
oor and higher
fl
oors.
A ceiling support should be used below the
fl
at ceiling.
To install the
fi
restop and support, cut and frame a 10” (254 mm)
square hole centered on the small hole previously drilled. See
fi
gure 36.
Fit vent accessory elbows and pipe lengths as required
up through ceiling support boxes and
fi
restops.
If installation includes offset, support the offsetting pipes
every 3’ (1 m) with wall straps. See
fi
gure 35.
Cut a hole in the roof centered on the small hole.
The hole must allow for the minimum clearances to
combustible materials. See
Location
section in this
manual.
Fit pipe lengths through the roof. Fit roof
fl
ashing
securing it with roo
fi
ng nails.
Fit storm collar and termination cap.
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Figure 35 Through the roof installation
Figure 36 Firestop hole
Co-Linear Vent Installations
The chimney and
fi
replace opening sizes are shown in
Dimensions
and
Location
sections of this manual.
Place the appliance (
fi
tted with the co-linear adapter) near the
fi
replace opening but
allow space for manipulating the chimney liners on to the appliance.
Drop the 3” dia.
fl
exible liners into the chimney from outside.
Fit the liners to the co-linear adapter paying attention to inlet and exhaust and move
the appliance to its proper position. Be aware of the minimum liver bend radius and
maximum liner horizontal run shown on page 17 of this manual.
Fit the termination kit and
fl
ashing to the exterior of the chimney.
Secure the appliance to the
fl
oor or wall if necessary.
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