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15
TERMINATION CLEARANCES SIDEWALL DIRECT VENT
V X
VENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED
v
v
A
G
V
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
V
C
B
B
B
B
F
B
V
V
A
J
V
H
M
X
X
V
V
K
B
E
D
L
DIRECT VENT
(using outdoor air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
Figure 9G.
Vent terminal clearances for “Direct Vent” installations. Direct Vent congurations use outdoor air for combustion.
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
A
Clearance above grade,
veranda, porch, deck or
balcony
12inches(30cm) 12inches(30cm)
H
Clearance to each side
of center line extended
above meter/regulator
assembly
3feet(91cm)withinaheight15
feet(4.5m)abovethemeter/
regulator assembly
3feet(91cm)withinaheight
15feet(4.5m)abovethe
meter/regulator assembly*
B
Clearance to window or
door that may be opened
6inches(15cm)forappliances
upto10,000Btu/hr(3kW),12
inches(30cm)forappliances
between10,000Btu/hr(3kW)
and100,000Btu/hr(30kW),36
inches(91cm)forappliances
above100,000Btu/hr(30kW)
6inches(15cm)
for appliances up to
10,000Btu/hr(3kW),
9inches(23cm)for
appliances between
10,000Btu/hr(3kW)
and50,000Btu/hr(15
kW),12inches(30cm)
for appliances above
50,000Btu/hr(15kW)
I
Clearance to service
regulator vent outlet
3feet(91cm) 3feet(91cm)*
C
Clearance to
permanently closed
window
6inches(15cm)* 6inches(15cm)*
J
Clearance to a non
mechanical air supply
inlet into building or
combustion air inlet to
any other appliance
6inches(15cm)forappliancesup
to10,000Btu/hr(3kW),12inches
(30cm)forappliancesbetween
10,000Btu/hr(3kW)and100,000
Btu/hr(30kW),36inches(91cm)
for appliances above 100,000 Btu/
hr(30kW)
6inches(15cm)for
appliances up to 10,000
Btu/hr(3kW),9inches(23
cm)forappliancesbetween
10,000Btu/hr(3kW)and
50,000Btu/hr(15kW),12
inches(30cm)forappliances
above50,000Btu/hr(15kW)
D
Vertical clearance to
ventilatedsoftlocated
above the terminal within
a horizontal distance of
2feet(61cm)fromthe
center line of the terminal
12inches(30cm)* 12inches(30cm)*
K
Clearance to a
mechanical air supply
inlet
6feet(1.83m)
3feet(91cm)aboveifwithin
10feet(3m)horizontally
E
Clearance to unventilated
soft
12inches(30cm)* 12inches(30cm)*
L
Clearance above
paved sidewalk or
paved driveway located
on public property
7feet(2.13m)† 7feet(2.13m)†*
F
Clearance to outside
corner
2feet(60cm)* 2feet(60cm)*
M
Clearance under
veranda, porch, deck,
or balcony
12inches(30cm)‡ 12inches(30cm)‡*
G
Clearance to inside
corner
8ft.(2.44m)* 8ft.(2.44m)*
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
†Aventshouldnotterminatedirectlyaboveasidewalkorpaveddrivewaythatislocatedbetweentwosinglefamilydwellingsandservesbothdwellings.
‡Permittedonlyifveranda,porch,deck,orbalconyisfullyopenonaminimumoftwosidesbeneaththeoor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.