_lr *a
_] VENT TERMINAL
(_AIR SUPPLY INLET
E_ AREA WHERE TERMINAL IS NOT PERMITED
item Clearance Description Canadian installation (I) U.S Installation (2)
A Clearance above grade, veranda, porch, deck, balcony, or 12" (30cm) # 12" (30 cm)
anticipated snow level
B Clearance to a window or door that may be opened 6"(15crn)forappliances<10,OOOBTUH(3kW),12"(30 6" (15 crn) for appliances < 10,600 BTUH (3kW), 9" (23 cm)
cm) for appliances > 16,000 Btuh (3 kW) and <100,600 Btuh for appliances > 10.0O0 Btuh (3 kW) and < 50,000 Btuh (15
(30 kW), 36" (91 cm) for appliances > 160,000 Btuh (30 kW) kW), 12" (30 cm) for appliances > 56,006 Btuh (15 kW)
C Clearance to a permanently closed window
D Vetfical clearance to a ventilated soffit located above the
terminal within a horizontal distance of 2"(61 cm) from the
centerline of the terminal
E Clearance to an unventilated soffit
P Clearance to an outside corner
G Clearance to an inside corner
H Clearance to each side of the centedine extended above 3" (91 cm) within 15 (4.5 m) above the meter/regulator 3" (91 cm) within 15"(45 m) above the meter/regulator
electrical meter or gas service regulator assembly assembly assembly
I Clearance to service regulator vent outlet 3" (91 cm)
J Clearance to non-mechanical air supply inlet to building or 6" (15 ore) for appliances < 10,OOOBTUH (3kW), 9" (23 ore) 6" (t 5 ore) for appliances < 10,OOOBTUH (3kW), 9" (23 ore)
the combustion air inlet to any other appliance for appliances > 10.0O0 Btuh (3 kW) and < t 06,000 Btuh (30 for appliances > 10.0O0 Btuh (3 kW) and < 50,000 Btuh (15
kW)and < 50,000 Btuh (15kW), 12"(30cm) forappliances kW), 12" (30cm)for appliances > 50,060 Btuh (15 kW)
> 50,000 Btuh (I5 kW)
K Clearance to a mechanical air supply inlet 6" (1.83 m) 3" (91 cm) above if within 10'(3m horizontally)
L Clearance under a veranda, porch, deck. or balcony 12" (30 cm) +
M Clearance to each side of the centedine extended above or 12" (30 cm) 12" (30 cm)
below vent terminat of the furnace to a dryer or water heater
vent, or other appliances direct vent intake or exhaust
N Clearance to the vent terminal of a dryer vent, water heater 3" (91 cm) 3" (91 cm)
vent. or other appliances direct vent intake or exhaust.
O Clearance from a plumbing vent stack 3" (91 cm) 3" (91 cm)
(1) In accordance with the current CSA B 149 1, Natural Gas and Propane Installafion Code
(2) In accordance with the current ANSl Z223.1/NFPA 54. Nafional Fuel Gas Code
# 18" (46cm)aboveroofsurface
+ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of t_vo sides beneath the floor
For clearances not specified in ANSi Z223.1/N PPA 54 or CSA B149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the
manufactureCs installation instructions
Notes:
1. The vent for this appliance shall not terminate
a Over public walkways; or
b. Near soffit vents or crawl space vents or other areas where condensate or vapor could create a nusiance or hazard or property damage; or
c Where condensate vapor could cause damage or could be detrimental to the operafion of regulators, relief valves, or other equiprnent.
2. When Iocafing vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combusfiob products of adjacent vents
Recirculafion can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat exchangers.
A03227
Table 5--Direct Vent Termination Clearance
26
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