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A = Clearance above grade, veranda, porch, deck, or balcony
[*12 inches (30mm) minimum]
B =
Clearance to window or door that may be opened
[
*
12 Inches (30 cm) minimum]
C = Clearance to permanently closed window [minimum 12 Inches (30 cm)
recommended to prevent condensation on window]
D = Vertical clearance to ventilated soffit located above the terminal within a
horizontal distance of 2 feet (60 cm) from the centre -line
of
the
Terminal [18 Inches (46 cm) minimum]
E = Clearance to unventilated
soffit [12 Inches (30 cm) minimum]
F = Clearance to outside corner [12 Inches minimum]
G = Clearance to inside corner [12 inches minimum]
H = * Not to be Installed above a meter/regulator assembly within 3 feet (90
cm) horizontally from the centre line of the regulator
I = Clearance to service regulator vent outlet [*
6 feet (1.8 m) Minimum]
J = Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance [12 Inches (30 cm)
minimum]
K = Clearance to a mechanical air supply Inlet [*
6 feet (1.8 m) minimum]
L = ***Clearance above paved side-walk or paved driveway located on
public property [* 7 feet (2.1 m) minimum]
M = Clearance under veranda, porch, deck, or balcony [*12 Inches (30 cm)
minimum **]
*** A vent shall not terminate directly above a side-walk 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 installation Codes (1991) Note: local Codes or Regulations may require different clearances
