For C
Canadian IInstallations
Agricultural B
Building H
Heaters:
Installation of the heater requires mechanical ventilation of
not less than 3 CFM per 1,000 BTU input of the heater. The
mechanical ventilation shall be interlocked with the heater
to prevent operation of the heater unless the ventilation air
flow is proven by an air flow proving device.
The exhaust fan CFM output must equal or exceed the
ventilation air to support the combustion requirement
stated in the Heater Specification table for the specific
model being used.
MECHANICAL VENTILATION INTERLOCK WIRING
29
THERMOSTAT
EXHAUST
FAN
HEATER
AIR PROVING DEVICE
EXHAUST FAN
L1
L2
