19
terMInatIon clearances sIdewall power vent
V
X
VENT TERMINAL
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
v
v
A
G
V
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
V
C
B
B
B
B
F
B
V
V
A
J
V
H
M
X
X
V
V
K
B
E
D
L
POWER VENT
(using room air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
fIGure 15.
Vent terminal clearances for “Power Vent” installations. Power Vent configurations use room air for combustion.
us InstallatIons
us InstallatIons
a
Clearance above grade, veranda, porch,
deck or balcony
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 (4.5 m)
above the meter/regulator assembly*
B
Clearance to window or door that may
be opened
4 feet (1.2 m) below or to side of opening; 1
foot (30 cm) above opening
I
Clearance to service regulator vent outlet
3 feet (91 cm)*
c
Clearance to permanently closed window
12 inches (30 cm)*
j
Clearance to a non mechanical air supply
inlet into building or combustion air inlet to
any other appliance
4 feet (1.2 m) below or to side of opening;
1 foot
(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
12 inches (30 cm)*
K
Clearance to a mechanical air supply inlet
3 feet (91 cm) above if within
10 feet (3 m) horizontally
e
Clearance to unventilated soffit
12 inches (30 cm)*
l
Clearance above paved sidewalk or paved
driveway located on public property
7 feet (2.13 m)
†
f
Clearance to outside corner
2 feet (60 cm)*
M
Clearance under veranda, porch, deck, or
balcony
12 inches (30 cm) ‡
G
Clearance to inside corner
18 inches (45 cm)*
In accordance with the current ANSI Z223.1/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 veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
vent pIpe terMInatIon
The first step is to determine where the vent pipe will terminate.
See Figures 15, 20 and 21. The vent may terminate through a
sidewall as shown in Figure 20 or through the roof as shown
in Figure 21.
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the
National Fuel Gas Code, (ANSI Z223.1, 12.9.1 through 12.9.4).
Instructions on proper installation through a sidewall are provided
in Figure 15.
Plan the vent system layout so that proper clearances are
maintained from plumbing and wiring.
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 NEW WATER
HEATER and INSTALLING THE WATER HEATER, and with the
National Fuel Gas Code and local codes.
