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A =
*Clearance above grade, veranda, porch, deck or balcony
[*12 inches (305 mm) minimum]
B =
clearance to window or door that may be opened [*12 inches
(305 mm) minimum for appliances < 100,000 Btuh (30kW)
C =
clearance to permanently closed window [minimum 12 inches
(305 mm) recommended to prevent condensation on
window]
D =
vertical clearance to ventilated soffit located above the terminal
within a horizontal distance of 24 inches (609 mm) from the
center of the terminal [18 Inches (457 mm) minimum
E =
clearance to unventilated soffit [12 inches 305 mm)
minimum]
F =
clearance to outside corner [See Page 20]
G =
clearance to inside corner [See Page 20]
H =
*not to be installed above a meter/regulator assembly within
3 feet (914 mm) horizontally from the center-line of the
regulator
I =
clearance to service regulator vent outlet [*6 feet (1.8 m)
minimum]
38717-2-0719
vENT ClEARANCES
Figure 35
J =
K =
L =
M =
†
¥
*
clearance to non-mechanical air supply inlet to building or
the combustion air inlet to any other appliance [*12 inches
(305 mm) minimum for appliances ≤ 100,000 Btuh (30 kW)
36 inches (914 mm) minimum for appliances > 100,000 Btuh
(30kW)]
clearance to a mechanical air supply inlet [* 6 feet (1.8 m)
minimum]
†clearance above paved sidewalk or a paved driveway located
on public property [*7 feet (2.1 m) minimum]
clearance under veranda, porch, deck, or balcony [*12 inches
(305 mm) 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 veranda, porch, deck, or balcony, is fully
open on a minimum of 2 sides beneath the floor*
as specified in CGA B149 Installations Codes or ANSI Z223.1.
Note: Local Codes or Regulations may require different
clearances.
Page 21
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