EXTERIOR VENT CLEARANCE REQUIREMENTS
a=
Air
Supply Inlet
Cl=
Vent
Terminal
A
r
Area
W)ma
Tminal Is
Not
Pennmed
I
A
=
clearance above grade, veranda, porch, deck, or balcony
12 inches (30 cm) minimum
B
=
clearance to window or door that may be opened
U.S.
-
9 inches
(22.5
cm) minimum
Canada
-
12 inches
(30
cm) minimum
C
=
clearance to permanently closed window
-
recommended to
prevent condensation on window
U.S.
-
9
inches (22.5 cm) minimum
Canada
-
12
inches (30 cm) m!nlmum
D
=
vertical ciearance to soffit located above the terminal
verlaled sorl
18
rcnes 146
CT)
ntnlmm
~nvent ate0
SOY
'2
ncpes
(46 cn,
T
n
~1-n
F
=
clearance to outside comer
12 inches (30
cm) minimum
G
=
clearance to inside comer
U.S.
-
6
inches (15.2 cm) minimum
Canada
-
2 feet
(60
cm) minimum
H
=
not be installed above a metedregulator assembly or within
3 feet (90 cm) horizontally from the center line of the
regulator.
I
Note:
Check
local codes or regulations for variations.
I
=
clearance to service regulator vent outlet
U.S.
-
3
feet
(
90 cm) minimum
Canada
-
6
feet (1.8 m) minimum
J
=
clearance to air supply inlet to building or Vle combustion
air inlet to any other appliance.
non-mechanical inlet:
US
-
9
inches (22.5 cm) minimum
Canada
-
12 inches
(
30 cm) minimum
mechanical air supply:
6
feet (1.8 m) minimum
L
=
clearance above paved sidewalk or paved driveway located
on public
propeq
7
feet (2.1 m) minimum
Note:
A
vent shall
not
terminate directly above a sidewalk
or paved dnveway which is located between two
(2)
single
tami/y dwellings andserves
both
dwellings.
M
=
clearance under veranda, parch, deck, or balcony where
fully open on a minimum of two (2) s~des beneath the floor
12 inches (30
cm) minimum
-1
Figure
6
NOE.
OIAGRkLISd
IUUSTUATIOIIS
NOTTO
SCALE
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