14
Appendix
XG0521 - 180904
Appendix A: Powervent Terminations
Location
A
clearances above grade, veranda, porch, deck, or balcony [*12 inches (30 cm) minimum]
B
clearance to window or door that may be opened [* 12 inches (30 cm) minimum]
C
clearance to permanently closed window [minimum 12 inches (30 cm) recommended to prevent condensation on window]
D
vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet (60 cm) from the edge of the terminal [0 inches (0 cm) minimum]
E
clearance to unventilated soffit [0 inches (0 cm) minimum]
F
clearance to outside corner [6 inches (15 cm) minimum]
G
clearance to inside corner [3 inches (7.5 cm) minimum]
H
* not to be installed above a meter/regulator assembly within 3 feet (90 cm) horizontally from the center-line of the regulator
I
clearance to service regulator vent outlet [* 6 feet (1.8 m) minimum]
J
clearance to non mechanical air supply inlet to building or the combustion air inlet to any other appliance [* 12 inches (30 cm) minimum]
K
clearance to a mechanical air supply inlet [* 6 feet (1.8 m) minimum]
L
^ clearance above paved side-walk or a paved driveway located on public property [* 7 feet (2.1 m) minimum]
M clearance under veranda, porch, deck, or balcony [0 inches (0 cm) minimum**]
N
18" minimum chase height
O 4 feet clearance from roof mounted power vent to wall
^ a vent shall not terminate directly above a side-walk or paved driveway which is located between two single family dwellings and serves both dwellings*
** only permitted if veranda, porch, deck, or balcony is fully open on a minimum of 2 sides beneath the floor*
* as specified in CGA B149 Installation Codes, Note: local Codes or Regulation may require different clearances
* for U.S.A. Installations follow the current National Fuel Gas Code, ANSI Z223.1
M
K
I
A
V
H
A
J
B
N
O
P
C
A
V
V
A
V
B
F
B
L
V
E
V
V
V
D
V
G
A
FIXED
CLOSED
FIXED
CLOSED
OPEN-
ABLE
OPEN-
ABLE
AIR SUPPLY INLET
VENT TERMINAL
GAS REGULATOR
AREA WHERE POWERVENT
IS NOT PERMITTED
B
B
G
G
