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VENT TERMINAL CLEARANCES
Figure 3
A= Clearance above grade, verandah, porch, deck, or
[balcony (*12 inches (30cm) minimum]
B= Clearance to window or door that may be opened [*12
inches (30cm) minimum]
C= Clearance to permanently closed window
[minimum 12 inches (30cm) recommended to
prevent condensation on window]
D= Vertical clearance to ventilated soffit located
above the terminal within a horizontal
distance of 2 feet (60cm) from the center-line
of the terminal 24 inches ( 60cm) minimum
E= Clearance to unventilated soffit
[18 inches (45cm) minimum]
F= Clearance to outside corner [12 inches minimum]
G= Clearance to inside corner [`12 inches minimum]
H= *Not to be installed above a meter/regulator
assembly within 3 feet (90cm) horizontally from
the center-line of the regulator
I= Clearance to service regulator vent outlet
[*6 feet (1.8m) minimum]
J= Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any
other appliance [12 inches (30cm) minimum]
K= Clearance to a mechanical air supply inlet
[*6 feet (1.8m) minimum]
L= *** Clearance above paved side-walk or paved
driveway located on public property
[*7 feet (2.1m) minimum]
M= Clearance under verandah, porch, deck, or
balcony [*24 inches (60cm) minimum **]
*** A vent shall not terminate directly above a sidewalk or paved driveway, which is located between two single family dwellings and serves
both dwellings.
** Only permitted if verandah, porch, deck, or balcony, is fully open on a minimum of 2 sides beneath the floor
• As specified in CGA B149 Installation Codes (1991) Note: Local Codes or Regulations may require different clearances
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