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30794-4-0513
Page 15
Figure 11
A = *Clearance above grade, veranda, porch, deck or balcony
[*12 inches (304.8 mm) minimum]
B = Clearance to window or door that may be opened [*9 inches
(228.6 mm) minimum for appliances < 50,000 Btuh
(14.6 kW)
C = Clearance to permanently closed window [minimum 12 inches
(304.8 mm) recommended to prevent condensation on
window]
D = Vertical clearance to ventilated soffit located above the terminal
within a horizontal distance of 24 inches (609.6 mm) from
the top of the terminal
E = Clearance to unventilated soffit [24 inches 609.6 mm)
minimum]
F = Clearance to outside corner [12 inches (304.8 mm)
minimum]
G = Clearance to inside corner [9 inches (228.6 mm) minimum]
H = *Not to be installed above a meter/regulator assembly within
3 feet (914.4 mm) horizontally from the centerline of the
regulator
I = Clearance to service regulator vent outlet [*6 feet (1.83 m)
minimum]
J = Clearance to non-mechanical air supply inlet to building
or the combustion air inlet to any other appliance [*12
inches (304.8 mm) minimum for appliances ≤ 100,000 Btuh
(30 kW)
36 inches (914.4 mm) minimum for appliances > 100,000 Btuh
(30 kW)]
K = Clearance to a mechanical air supply inlet [* 6 feet (1.83 m)
minimum]
L = †Clearance above paved sidewalk or a paved driveway
located on public property [*7 feet (2.13 m) minimum]
M = Clearance under veranda, porch, deck, or balcony [*12 inches
(304.8 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.
VENT CLEARANCES