Installation / Operation Instruction Manual

20
Figure 11a - Vent Terminal Clearances (Other than Direct Vent or Powered Direct Vent Installations)
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
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”.
NOTICE
If 2 in (5.1 cm) pipe is used, then use a 2 in to 3 in reducer to adapt to the 3 in (7.6 cm) vent terminal size. If a 2 in
(5.1 cm) vent terminal is preferred, this terminal is available from your supplier.