29

TERMINATION CLEARANCES SIDEWALL POWER VENT

V XVENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED

v

v

AG
V
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
V
CBB
B
B
F
B
V
V
AJ
V
HMXX
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 congurations use room air for combustion.
US INSTALLATIONS 1US INSTALLATIONS 1

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 soft 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
EClearance to
unventilated soft 12 inches (30 cm)* L
Clearance above paved
sidewalk or paved
driveway located on
public property
7 feet (2.13 m)
FClearance to outside
corner 2 feet (60 cm)* M
Clearance under
veranda, porch, deck, or
balcony
12 inches (30 cm) ‡
GClearance to inside
corner 18 inches (45 cm)*
1 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.† A vent shall not terminate where it may cause hazardous frost or ice accumulations on adjacent property surfaces.‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.