13369-1-0203
Page 17
Figure 27
A =
*Clearance above grade, veranda, porch, deck or balcony
[*12 inches (30cm) minimum]
B =
clearance to window or door that may be opened [*12
inches (30cm) minimum for appliances < 100,000 Btuh
(30kW)
36 inches (90cm) minimum for appliances > 100,000
Btuh (30kW)]
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 18 inches (46 cm)
from the top of the terminal
E =
clearance to unventilated soffit [12 inches 30cm) 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
