VENT TERMINATION CLEARANCES
FOR INSTALLATIONS IN THE USA AND CANADA*
[] - G71MPP VENT TERMINATION
O - AIR INLET OF OTHER APPLIANCE
D!
A - Clearance above grade - 12 in. (305mm) minimum.
B - Clearance to window or door that may be opened -
for vent installations in USA- 12 in (305mm) minimum.
for vent installations in Canada - 12 in. (305mm) mini-
mum for appliances _ 100,000 Btuh (30 kW);
36 in (09m) minimum for appliances > 100,000 Btuh (30
kW)
C - Do not position terminations directly under roof eaves.
D - Clearance to electric meters, gas meters, regulators, and
refief equipm ent -
for vent installations in USA -48 in (1219mm) minimum.
for vent installations in Canada - see current edition of
CSA B149 Code
E - Clearance to non-mechanical air supply inlet or outlet
for vent installations in USA -48 in. (1219mm) minimum
horizontal and below, 12 in, (305ram) minimum above.
for vent installations in Canada - 12 in. (305mm) mini-
mum for appliances _ 100,000 Btuh (30 kW);
36 in, (0.9m) minimum for appliances > 100,000 Btuh (30
kW).
F - Clearance to mechanical air supply inlet --
for vent installations in USA - 36 in. minimum (914mm).
G - Clearance to mechanical air supply inlet --
for vent installations in Canada - 72 in. (1829mm) mini-
mum.
H - Do notpoint terminations into recessed areas such as win-
dow wells, stairwells or alcoves.
J - Do not position terminations directly above a pubfic walk-
way.
* Note -
(I) Dimensions are from the current edition of The National Fuel Gas Code - ANSI-Z22& 1/NFPA 54 for USA installa-
tions. In Canada, refer to current edition of CSA B149 installation codes. Local codes or regulations may require different
clearances.
(11)In Non-Direct Vent installations, combustion air is taken from indoors and the flue gases are discharged to the outdoors.
FIGURE 23
Page 20
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