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P a g e
EXTERIOR VENT LOCATIONS AND RESTRICTIONS
ALL MEASUREMENTS FROM CENTERLINE OF VENT CAP
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Vent Terminal
-
Air Supply Inlet
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Area where terminal is
not permitted
A =
Clearance above grade, veranda, porch, deck, or balco-
ny (*12 inches (30 cm) minimum). Vinyl surfaces re-
quire 24” min.
H =
*Not to be installed above a meter/regulator assembly
within 3 feet (90 cm) horizontally from the center-line of
the regulator
B =
Clearance to window or door that may be opened
(*12 inches (30 cm) minimum.
I =
*Clearance to service regulator vent outlet *3 feet (92 cm)
minimum.
C =
*Clearance to permanently closed window (minimum
12 inches (30 cm) recommended to prevent condensa-
tion on window)
J =
*Clearance to non-mechanical air supply inlet to building
or the combustion air inlet to any other appliance.
12 inches (30 cm) minimum.
D =
*Vertical clearance to ventilated soffit located above
the terminal from the center-line of the terminal 24” (60
cm) min.
K =
*Clearance to a mechanical air supply inlet 6 feet (1.8 m)
minimum
E =
*Clearance to unventilated soffit 24” min (60 cm) min.
L =
† Clearance above paved side-walk or a paved driveway
located on public property (*7 feet (2.1 m) minimum)
F =
Clearance to outside corner - 7 inches (18 cm).
M =
Clearance under veranda, porch, deck, or balcony (*12
inches (30 cm) minimum ‡)
G =
Clearance to inside corner - 12 inches (30 cm). Vinyl
surfaces require 24” min (60 cm).
N=
Minimum 24” horizontal clearance to any surface, such as
an exterior surface, for vertical terminations.
† A vent shall not terminate directly above a sidewalk or paved driveway, which is located between two single-family dwell-
ings and serves both dwellings.
‡ Only permitted if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* As specified in CGA B1:19 Installation Codes (1991).
Note
: Local codes or regulations may require different clearances.
Exterior Vent