38
420012001500 - 03182024 - Rev. 04
Part 5 - Venting
B
H
B
B M
G
E
LP-179-CC
A
FIXED
CLOSED
OPERABLE
I
E
E
E
CLOSED
OPERABLE
FIXED
03/28/17
E
E
D
I
E
E
I
DETAIL
I
INSIDE CORNER
A
B
B
J
L
K
F
C
K
E
E
E
Exhaust Vent Terminal
I
Intake Pipe Terminal
Area Where Intake Terminal Is Not Permitted
Table 13 - Vent Termination Clearances - *NOTE: For clearances not specified in ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1
for Canada, please use clearances in accordance with local installation codes and the requirements of the gas supplier.
Figure 29 - Exit Terminals for Direct Vent Systems - ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1 for Canada
D. Exhaust Vent and Intake Pipe Location
DESCRIPTION US CANADA
A Clearance above grade, veranda, porch, deck, or balcony 1 foot (30 cm)
B Clearance to window or door that may be opened
Direct Vent 1 foot 1 ft (30 cm) for inputs up to
and including 100 MBH
3 ft (91 cm) for inputs
exceeding 100 MBH
Power Vent
4 ft below or to side of
opening; 1 ft above opening
C Clearance to permanently closed window Not Applicable
D
Vertical clearance to ventilated soffit located above the terminal within a horizontal
distance 2 feet (61 cm) from the center line of the terminal
6 feet (1.83 m)
E Clearance to unventilated soffit Not Applicable
F Clearance to outside corner Not Applicable
G Clearance to inside corner 3 feet (91 cm)
H Clearance to each side of center line extended above meter / regulator assembly 3 feet (91 cm) within a height of 15 feet (4.6 m)
I Clearance to service regulator vent outlet
refer to
ANSI Z223.1 / NFPA 54
refer to CSA B149.1
J
Clearance to nonmechanical air supply inlet to building or the combus-
tion air inlet to any other appliance
Direct Vent 1 foot
3 feet (91 cm)
Power Vent
4 ft below or to side of
opening; 1 ft above opening
K Clearance to mechanical air supply inlet
3 feet above if within 10 feet
horizontally
6 feet (1.83 m)
L
Clearance above paved sidewalk or paved driveway located on pub-
lic property
Direct Vent *
7 feet (2.13 m)
Power Vent 7 feet (2.13 m)
M Clearance under veranda, porch deck, or balcony * 1 foot (30 cm)
The building owner is responsible for keeping the exhaust and intake
terminations free of snow, ice, or other potential blockages, as well
as scheduling routing maintenance. Failure to keep the vent piping
terminations clear and properly maintain the heater could result in
property damage, severe personal injury, or death.
Appliances that terminate through an outside wall of a building and
discharge flue gases perpendicular to the adjacent wall shall be located
not less than 10 ft (3.05 m) horizontally from an operable opening in an
adjacent building.
This requirement shall not apply to vent terminals that are 2 ft (61 cm) or
more above or 25 ft (7.62 m) or more below operable openings.
WARNING WARNING
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