Lennox International Inc. G24-200 User Manual

Page 23

Page 23

FIGURE 11

VENT TERMINATION CLEARANCES

FOR INSTALLATIONS IN THE USA AND CANADA*

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.

less than
10 ft (3.048M)

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

−

VENT TERMINATION

−

AIR INLET OF OTHER APPLIANCE