Vent Termination Clearances

FOR INSTALLATIONS IN THE USA AND CANADA*

− VENT TERMINATION

− AIR INLET OF OTHER APPLIANCE

less than

10 ft (3.048M)

A − Clearance above grade − 12 in. (305mm) minimum.

B − Clearance to window or door −

for vent installations in USA − 48 in. (1219mm) minimum horizontal and below, 12 in. (305mm) minimum above. for vent installations in Canada − 12 in. (305mm) minimum for appliances 100,000 Btuh (30 kW);

36 in. (0.9m) 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 relief equipment −

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

for vent installations in USA − 48 in. (1219mm) minimum hor- izontal and below, 12 in. (305mm) minimum above.

for vent installations in Canada − 12 in. (305mm) minimum 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) minimum.

H − Do not point terminations into recessed areas such as window wells, stairwells or alcoves.

J − Do not position terminations directly above a walkway.

* Note −

(I)Dimensions are from the current edition of The National Fuel Gas Code − ANSI-Z223.1/NFPA 54 for USA installations. In Canada, refer to current edition of CSA building code. Local codes or regulations may require different clearances.

(II) In Non-Direct Vent installations, combustion air is taken from indoors and the flue gases are discharged to the outdoors.

FIGURE 11

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