Page 14 R-5086
Figure 20
A = *Clearance above grade, veranda, porch, deck or balcony [*12
inches (30cm) minimum]
B = clearance to window or door that may be opened [*9 inches
(23cm) minimum for appliances < 50,000 Btuh (14.6kW)
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 24 inches (61cm) from the top of
the terminal
E = clearance to unventilated soffitt [24 inches 61cm) minimum]
F = clearance to outside corner [12 inches (30cm) minimum]
G = clearance to inside corner [9 inches (22.5cm) 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 for appliances ≤ 100,000 Btuh (30 kW)
36 inches (90cm) minimum for appliances > 100,000 Btuh
(30kW)]
K = clearance to a mechanical air supply inlet [* 6 feet (1.8m)
minimum]
L= †clearance above paved sidewalk or a paved driveway located
on public property [*7 feet (2.1m) minimum]
M = clearance under veranda, porch, deck, or balcony [*12 inches
(30cm) 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 (Figure 20)