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D
V
V
E
F
IXED
C
L
OSED
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P
E
R
ABL
E
O
P
E
RA
B
LE
FIXE
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CLO
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ED
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The following information should be used for determining the proper location of the vent
terminal for direct vent tankless water heaters.
V
VVEENNTT TTEERRMMIINNAALL
X
AAIIRR SSUUPPPPLLYY IINNLLEETT
AARREEAA WWHHEERREE TTEERRMMIINNAALL IISS NNOOTT PPEERRMMIITTTTEEDD
Horizontal Vent Terminal Location
1 In accordance with current CAN/CGA-B149 Installation Codes.
2 In accordance with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code.
* If clearances are not specified, then follow local installation codes and the requirement of the gas supplier.
** For condensing appliances: The vent for this appliance shall not terminate over public walkways, near soffit vents, crawl space vents,
or other areas where condensate or vapor could create a nuisance, hazard or cause property damage, or where condensate or vapor
could cause damage or could be detrimental to the operation of regulators, relief valves or other equipment.
H = Clearance to each side of center
line extended meter/regulator
assembly. above
3 feet (91 cm) within a height 15 feet
(4.57 m) above the meter/regulator
assembly.
*
I = Clearance to service regulator
coaxial vent outlet.
3 feet (91 cm) *
J = Clearance to nonmechanical air
supply inlet to the combustion air
inlet to any building or other
appliance.
6 inches (15 cm) for appliances <
10,000 Btuh (3 kW), 12 inches (30 cm)
for appliances > 10,000 Btuh (3kW)
and <
100,000 Btuh (30kW), 36 inches
(91 cm) for appliances > 100,000 Btuh
(30kW).
6 inches (15 cm) for appliances <
10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Btuh (3kW) and <
50,000 Btuh (15kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15kW).
K = Clearance to mechanical air
supply inlet.
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet
(3 m) horizontally.
L = Clearance above paved sidewalk
or paved driveway located on
public property.
Not Allowed Not Allowed
M = Clearance under veranda, porch,
deck or balcony.
Not Allowed Not Allowed
CCaannaaddiiaann IInnssttaallllaattiioonnss
1
UUSS IInnssttaallllaattiioonnss
2
A= Clearance above grade, veranda,
porch, deck or balcony.
12 inches (30 cm) above anticipated
snow level.
12 inches (30 cm) above anticipated
snow level.
B= Clearance to window or door that
may be opened.
6 inches (15 cm) for appliances <
10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and <
100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
6 inches (15 cm) for appliances <
10,000 Btuh (3 kW), 9 inches (23 cm)
for appliances > 10,000 Btuh (3kW)
and <
50,000 Btuh (15kW), 12 inches
(30 cm) for appliances > 50,000 Btuh
(15kW).
C= Clearance to permanently closed
window.
* *
D= Vertical Clearance to ventilated
soffit located above the terminal
within a horizontal distance of 2
feet (61 cm) from the center line
of the terminal.
* *
E= Clearance to unventilated soffit.
* *
F= Clearance to outside corner.
* *
G= Clearance to corner.
* *
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