C = Clearance to permanently closed window12" (305mm) recommended to prevent window
condensation
12" (305mm) recommended to prevent window
condensation
D = Vertical clearance to ventilated sot located
above the terminal within a horizontal distance
of 2' (610 mm) from the center line of the
terminal
18" (458mm)18" (458mm)
E = Clearance to unventilated sot12" (305mm) 12" (305mm)
F = Clearance to outside corner see next pagesee next page
G = Clearance to inside corner see next pagesee next page
H = Clearance to each inside of center line
extended above meter/regulator assembly
3' (91cm) within a height of 15' (5m) above the
meter/regulator assembly
3' (91cm) within a height of 15' (5m) above the
meter/regulator assembly
I = Clearance to service regulator vent outlet3' (91cm)3' (91cm)
J = Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
6" (15cm) for appliances <10,000 BTU/h (3kW)
12" (30cm) for appliances >10,000 BTU/h (3kW)
and <100,000 BTU/h (30kW)
36" (91cm) for appliances >100,000 BTU/h (30kW)
6" (15cm) for appliances <10,000 BTU/h (3kW)
9" (23cm) for appliances >10,000 BTU/h (3kW) and
<50,000 BTU/h (15kW)
12" (30cm) for appliances >50,000 BTU/h (15kW)
K = Clearance to mechanical air supply inlet6' (1.83m)3' (91cm) above if within 10' (3m) horizontally
L = Clearance above paved sidewalk or paved
driveway located on public property
7' (2.13m)†7' (2.13m)†
M = Clearance under veranda, porch, deck or
balcony
12" (30cm)‡12" (30cm)‡
N = Clearance above a roof shall extend a minimum of 24” (610mm) above the highest point when it passes through the roof surface, and any other obstruction
within a horizontal distance of 18” (450mm).
Figure 2.10 - Vent termination clearances.
NOTE:
1. Local codes or regulations may require dierent clearances.
2. The special venting system used on Direct Vent Fireplaces are
certied as part of the appliance, with clearances tested and
approved by the listing agency.
3. HHT assumes no responsibility for the improper performance
of the appliance when the venting system does not meet these
requirements.
1. In accordance with the current CSA-B149 Installation Codes
2. In accordance with the current ANSI Z223.1/NFPA 54 National
Fuel Gas Codes
† 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 2 sides beneath the oor.
V
X
X
X
D
E
B
B
B
C
B
M
B
A
J
K
F
L
VENT TERMINATION AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED
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