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Appendix A: Power Vent Locations
Horizontal
Detail
A = clearance to the termination frame above grade, veranda, porch, deck,
or balcony [30 inches (75 cm) minimum]
B = clearance to door, or sides and top of window, that may be opened [30
inches (75 cm) minimum for appliances.
C = clearance to bottom of window that may be opened horizontally [36
inches (92 cm) minimum for appliances.
D = no clearance to permanently closed window when installed with approved
glass penetration termination
E = clearance to permanently closed window [30 inches 75 cm recommended
to prevent condensation on window]
F = vertical clearance to ventilated soffit located above the termination
within a horizontal distance of [30 inches 75 cm] from the centreline of
the termination [30 inches (75 cm) minimum]
G = c l e a r a n c e
t o
u n v e n t i l a t e d
( 7 5
c m )
m i n i m u m
[30 inches (75 cm) minimum to combustibles]
H = clearance to outside corner [30 inches (75 cm) minimum]
I =
clearance to inside corner [30 inches (75 cm) minimum]
J = * not to be installed above a meter/regulator assembly within
40" (103 cm) horizontally from the centreline of the regulator
K = clearance to service regulator vent outlet [3 feet minimum in the United
States] [*6 feet (1.8 m) minimum in Canada]
L = clearance to non-mechanical air supply inlet to building or the combustion
air inlet to any other appliance [16 inches (41 cm) minimum for appliances
≤100 000 BTU/H (30kW)]
M = clearance to mechanical air supply inlet [*6 feet (1.8 m) minimum]
XG0649 - 080921
Appendix
Appendix
s o f f i t
[ 3 0
i n c h e s
t o
n o n - c o m b u s t i b l e s ]
H36PVN Power Vent Indoor Gas Fireplace
V
Vertical Detail
N =
clearance above paved sidewalk or a paved driveway located on public
†
property [*7 feet (2.1 m) minimum]
P = clearance under veranda, porch, deck, or balcony [30 inches (75
cm) minimum
to non-combustibles] [30 inches (75 cm) minimum
‡
combustibles]
Q = clearance above a roof [18 inches (46 cm) minimum]
R = clearance to adjacent walls and neighboring buildings [30 inches (75
cm) minimum]
S = clearance from corner in recessed location [30 inches (75 cm) minimum]
T = maximum depth in recessed location [48 inches (122 cm) minimum]
U = minimum width for back wall of recessed location [60 inches (150 cm)
minimum]
V = minimum horizontal clearance between the frames of two terminations
that are level, (see applicable Detail).
W = horizontal clearance between the frames of two terminations that are
not level. [30 inches (75 cm) 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 has an open side that
‡
is equal to or greater than the depth of the enclosed area
*
as specified in CGA B149 Installation Codes. Note: local Codes or
Regulations may require different clearance.
to
‡
Page 35
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