Manual

21
VENT/AIR INTAKE TERMINAL LOCATIONS
Direct Vent Terminal Location
Plan the vent system layout so that proper clearances are maintained from plumbing and wiring. Before
the vent is installed, determine the vent pipe termination location as shown below in the Vent Terminal
Location illustration.
Vent/Air Intake Terminal Positions – MINIMUM Dimensions
Figure 7
Canadian
Installations
1
US Installations
2
Canadian Installations
1
US Installations
2
A= Clearance above
grade, veranda,
porch, deck or
balcony
12 inches (30 cm) 12 inches
(30 cm)
H= Clearance to each side
of center line extended
above meter/regulator
assembly
36 inches (91 cm)
within a height 15 feet
(4.6 m) above the
meter/regulator
assembly
*b
B= Clearance to
widow or door that
may be opened
36 inches (91 cm)
for appliances >
100,000 Btuh (30
kW)
12 inches (30
cm) for
appliances >
50,000 Btuh (15
kW)
I= Clearance to service
regulator vent outlet or
oil tank vent
36 inches
(91 cm)
*b
C= Clearance to
permanently
closed widow
*b *b J= Clearance to non-
mechanical air supply
inlet to building or the
combustion air inlet to
any other appliance
36 inches (91 cm) for
appliances > 100,000
Btuh (30 kW)
12 inches (30 cm)
for appliances >
50,000 Btuh (15
kW).
D= Vertical clearance
to ventilated soffit
located above the
terminal within a
horizontal
distance of 2 feet
(61 cm) from the
center line of the
terminal
*b *b K= Clearance to a
mechanical air supply
inlet
6 feet
(1.83 m)
3 feet (91 cm)
above if within 10
feet horizontally
E= Clearance to
unventilated soffit
*b *b L= Clearance above paved
sidewalk or paved
driveway located on
public property
7 feet
(2.13 m)†
*b
F= Clearance to
outside corner
*b *b M= Clearance under a
veranda, porch, deck, or
balcony
12 inches (30 cm) ‡ *b
G= Clearance to
inside corner
36 inches
(91 cm)*a
36 inches
(91 cm)*a
1
In accordance with the current CAN/CGA-B149 Installation Codes.
2
In accordance with the current ANSI Z223.1-(Latest Edition)/NFPA 54 National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between
two single-family dwellings and serves both dwellings.
‡ Permitted only if a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath
the floor.
*a) A minimum clearance value determined by testing in accordance with section 2.20.
*b) “Clearance in accordance with local installation codes and the requirements of the gas supplier”.