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VENTING
Minimum Height (H) From Roof
Roof Pitch
Flat to 6/12
Over 6/12 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
VENTING CONSIDERATIONS—VERTICAL
TAKEOFF
Note: ALL venting considerations
• Dimensions of venting are based on using Dura Vent
elbows. Elbow curve radius dimensions may vary when
using other brands. In general, other brands have slightly
bigger radius.
• Minimum 24 inches vertical pipe section required at unit.
Refer to the "Venting Chart" section of this manual for
allowable horizontal runs.
• 2 inches clearance to combustibles required above
horizontal pipe. Slope horizontal pipe upwards 1/4 inch
per foot. 1 inch clearance required around sides and
bottom of horizontal pipe and around vertical pipe.
• When
calculating
effective
approximately 1-1/2 inch for pipe joint - for example, a
12 inches pipe section will add approximately 10 - 1/2
inches overall.
TOP OUTLET ONLY
This unit is supplied with a top vent outlet and should NOT
be field-converted to a rear vent outlet (see vent chart in this
manual).
VENT SEALING
Seal all outer coaxial pipe and elbow joints, including
sectioned elbow joints, using high quality, high temperature
2" wide self-adhesive aluminum foil tape (Nashua-322-2
brand or similar). Wrap the tape completely around all joints
and press firmly to seal. A high temperature black silicone
sealant may be used in the outer joints as a substitute to foil
Feet
Meters
1.0
0.30
1.25
0.38
1.5
0.46
2.0
0.61
2.5
0.76
3.25
0.99
4.0
1.22
5.0
1.52
6.0
1.83
7.0
2.13
7.5
2.27
8.0
2.44
pipe
lengths
subtract
17
tape. Ensure all the pipe joints have a minimum of -1/4"
overlap.
WALL THICKNESS
The appliance vent is suitable for penetrating a combustible
wall assembly up to 8" in thickness. A non-combustible wall
can be of any thickness up to the maximum horizontal run
of vent pipe allowed for the particular installation.
Align the vent
center to the
center of the frame
10" (254 mm)
FRAMING VENT IN COMBUSTIBLE WALLS &
CEILINGS
When penetrating through combustible walls and ceilings,
frame a minimum of 10 in x 10 in opening and ensure
that the insulation is kept clear of the vent pipe using either
a wall thimble or an attic insulation shield. Follow the
installation instructions supplied with the individual venting
components.
WEATHER SEALING & VAPOR BARRIERS
It is the installer's responsibility to ensure that vent installations
through exterior walls are caulked and weatherproofed in
such a manner as to:
• Prevent rain water from entering the wall from the weather
side by adequately caulking the outer vent plate to the
exterior wall surface.
• Prevent moisture inside the home from penetrating into
the wall structure by ensuring the inside wall plate is
adequately sealed to the inside vapor barrier.
• Prevent rain water and moisture from entering the walls
by sealing the joints between the outer vent tube and the
inner and outer wall plates. We recommend the use of a
high quality polyurethane sealant.
All horizontal pipe runs must be graded 1/4" per foot
upwards in the direction of the exhaust flow. The final pipe
length, when terminating through the wall may be graded
downwards slightly to prevent water migration.
Tape all joints
(including all
elbow joints)
10" (254 mm)
© 2021 Breckwell Hearth
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