VENT CLEARANCES
Figure 35
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)
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 (60 cm) from the center of the terminal [18 Inches (46 cm) minimum
E = clearance to unventilated soffit [12 inches 30cm) 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 (90cm) horizontally from the
I= clearance to service regulator vent outlet [*6 feet (1.8m) minimum]
J= clearance to
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.
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