WARNING!
Ventilation
2.0 Installation • Ventilation
Improper or insufficient ventilation may result in explosion, fire, health problems,
carbon monoxide poisoning or death. Vent enclosed spaces and buildings according
to national, provincial and local codes.
The infra-red heater must be vented in accordance with national, provincial and local codes and the guidelines in the
Brant Radiant Heaters PH Series manual. Refer to the lastest edition of the CAN/CSA B149.1 and 2.
It is required that the upper levels of the space to be heated are properly ventilated to supply combustion air to the
heaters and to sufficiently dilute the products of combustion. It is also important to keep the flue discharge area clear
of gas piping and electrical wiring (see Figure 2.6).
Provisions must also be made to provide sufficient fresh air intake area and exhaust air outlet area. Natural or
mechanical means shall be provided to supply and exhaust at least 4.0 C.F.M. per 1000 BTU/H of natural gas input,
4.5 C.F.M per 1000 BTY/H of L.P. gas input. Exhaust openings for the removal of flue products must be above the
level of the heater(s).
When insufficient air movement exists, induced air displacement is required. A balanced system is essential to avoid
negative building pressure which causes excessive infiltration, unfavorable drafts and affects combustion efficiency.
Air displacement may be accomplished by either gravity or mechanical means. Mechanical exhausters are preferred
and typically mounted at high points in the ceiling over where stagnant air accumulates inside. For a flat roof,
considerations of prevailing winds, high and low pressure areas, and distribution of air movement must be taken into
consideration when locating exhausters.
Best air distribution is accomplished by using a number of small exhausters versus one large exhauster. Provide a
minimum of one square inch of inlet area per 1000 BTU/H for combustion air supply. Inlet openings in the building
should be well distributed, located high on the wall and should direct incoming air upward to dilute products of
combustion while preventing drafts at lower levels. Inlets are typically 1 to 3 sq. ft.
In certain applications, local codes may require that mechanical exhaust systems be interlocked with the heater(s) to
enable both to function simultaneously or allow control of exhausters with a ceiling mounted humidistat.
Figure 2.6
•
Hot Flue Discharge
16
Discharge released from side
air channels. Keep area clear of
gas piping and electrical wiring.
