14
TERMINATION CLEARANCES SIDEWALL POWER VENT
V XVENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTEDv
v
AGV
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
V
CBBB
B
FB
V
V
AJV
HMXXV
V
KBEDLPOWER VENT(using room air for combustion)EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATIONFigure 9F.
Vent terminal clearances for “Power Vent” installations. Power Vent congurations use room air for combustion.
CANADIAN INSTALLATIONS 1US INSTALLATIONS 2CANADIAN INSTALLATIONS 1US INSTALLATIONS 2
A
Clearance above grade,
veranda, porch, deck or
balcony
12inches(30cm) 12inches(30cm) H
Clearance to each side
of center line extended
above meter/regulator
assembly
3feet(91cm)withinaheight15feet
(4.5m)abovethemeter/
regulator assembly
3feet(91cm)withina
height15feet(4.5m)
above the meter/regulator
assembly*
B
Clearance to window
or door that may be
opened
6inches(15cm)forappliancesupto
10,000Btu/hr(3kW),12inches(30
cm)forappliancesbetween10,000
Btu/hr(3kW)and100,000Btu/hr(30
kW),36inches(91cm)forappliances
above100,000Btu/hr(30kW)
4feet(1.2m)below
or to side of opening;
1foot(30cm)above
opening
I
Clearance to service
regulator vent outlet
3feet(91cm) 3feet(91cm)*
C
Clearance to
permanently closed
window
12inches(30cm)* 12inches(30cm)* J
Clearance to a non
mechanical air supply
inlet into building or
combustion air inlet to
any other appliance
6inches(15cm)forappliancesup
to10,000Btu/hr(3kW),12inches
(30cm)forappliancesbetween
10,000Btu/hr(3kW)and100,000
Btu/hr(30kW),36inches(91cm)
for appliances above 100,000 Btu/
hr(30kW)
4feet(1.2m)beloworto
side of opening; 1 foot
(30cm)aboveopening.
D
Vertical clearance to
ventilatedsoftlocated
above the terminal
within a horizontal
distanceof2feet(61
cm)fromthecenterline
of the terminal
12inches(30cm)* 12inches(30cm)* K
Clearance to a
mechanical air supply
inlet
6feet(1.83m)
3feet(91cm)aboveif
within
10feet(3m)horizontally
EClearance to
unventilatedsoft 12inches(30cm)* 12inches(30cm)* L
Clearance above paved
sidewalk or paved
driveway located on
public property
7feet(2.13m)† 7feet(2.13m)
FClearance to outside
corner 2feet(60cm)* 2feet(60cm)* M
Clearance under
veranda, porch, deck, or
balcony
12inches(30cm)‡ 12inches(30cm)‡
GClearance to inside
corner 8ft.(2.44m)* 8ft.(2.44m)*
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.†Aventshouldnotterminatedirectlyaboveasidewalkorpaveddrivewaythatislocatedbetweentwosinglefamilydwellingsandservesbothdwellings.‡Permittedonlyifveranda,porch,deck,orbalconyisfullyopenonaminimumoftwosidesbeneaththeoor.* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.