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© 2021 United States Stove Company
17
VENTING
12
x
H
LOWEST
DISCHARGE
OPENING
APPROVED CAP
APPROVED
VENT PIPE
ROOF PITCH = x/12
MINIMUM
12” (.30m)
Vertical Vent Cap Clearance
H - MINIMUM HEIGHT FROM ROOF
TO LOWEST DISCHARGE OPENING
Minimum Height (H) From Roof
Roof Pitch
Feet
Meters
Flat to 6/12
1.0
0.30
Over 6/12 to 7/12
1.25
0.38
Over 7/12 to 8/12
1.5
0.46
Over 8/12 to 9/12
2.0
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
4.0
1.22
Over 12/12 to 14/12
5.0
1.52
Over 14/12 to 16/12
6.0
1.83
Over 16/12 to 18/12
7.0
2.13
Over 18/12 to 20/12
7.5
2.27
Over 20/12 to 21/12
8.0
2.44
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 pipe lengths subtract
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 tape.
Ensure all the pipe joints have a minimum of -1/4”
overlap.
Tape all joints
(including all
elbow joints)
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