Installation / Operation Instruction Manual

16
Figure 3 – Intake Vent Terminal Clearances (Referencing Other Appliance Venting Locations)
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
3 feet (91 cm) within a
height 15 feet (4.6 m)
above the
meter/regulator
assembly
*b
B=
Clearance to window
or door that may be
opened
6 in (15cm) for
appliances ≤10,000
Btuh (3kW); 12 in (30
cm) for appliances
>10,000 Btuh (3kW)
and ≤100,000 Btuh
(30kW); 36 in (91 cm)
for appliances
>100,000 Btuh (30 kW)
4 feet (1.2 m)
below or to
the side of
opening; 12
inches (30
cm) above
opening
I=
Clearance to service
regulator vent outlet or oil
tank vent
36 inches
(91 cm)
*b
C=
Clearance to
permanently closed
window
*b
*b
J=
Clearance to non-
mechanical air supply inlet
to building or the
combustion air inlet to any
other appliance
6 in (15cm) for
appliances ≤10,000
Btuh (3kW); 12 in (30
cm) for appliances
>10,000 Btuh (3kW) and
≤100,000 Btuh (30kW);
36 in (91 cm) for
appliances >100,000
Btuh (30 kW)
4 feet (1.2 m)
below or to side
of opening;
12 inches (30
cm) above
opening.
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) †
7 feet
(2.13 m) †
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
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”.
Vent pipes serving power vented appliances are classified by building codes as “vent connectors.” Required
clearances from combustible materials must be provided in accordance with information in this manual under
Locating the Water Heater and Clearances, and with National Fuel Gas Code and local codes.