Full Product Manual

IHR Series Manual
12 13
Ventilation
It is required that the levels where heaters are mounted be properly ventilated to supply combustion air to
the heaters and to sufficiently dilute the products of combustion. It is also required that the flue discharge
area is kept clear of gas piping and electrical wiring (see Figure 2.4).
This infrared heater must be vented in accordance with national, state, provincial, and local codes and the
guidelines in this manual. In the United Sates refer to the latest edition of ANSI Z223.1 (NFPA 54) and in
Canada refer to the latest edition of the CAN/CGA B149.1 & B149.2 Standard.
Figure 2.4 • Hot Flue Discharge
Provisions must also be made to provide sufficient fresh air intake area and exhaust air outlet area. For
proper ventilation, a positive air displacement of 4 CFM/1,000 BTU/h of gas consumed mus be provided.
Where 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 natural or mechanical means. Mechanical exhausters are
preferred and typically mounted at high points on the roof where stagnant air accumulates inside the building.
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 1,000 BTU/h for combustion air supply. Inlet
opening in the building should be well distributed (see Figure 2.1) high in the sidewalls 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.
Local codes may require that mechanical exhaust systems be interlocked with heaters to enable both to
function simultaneously (see page 17, Figure 2.6) or allow control of exhausters with a ceiling mounted
humidistat.
2.0 Installation • Ventilation
Insufficient ventilation may result in health problems, carbon monoxide
poisoning, or death. Vent enclosed spaces and buildings according to
national, state, provincial, and local codes.
Improper venting may result in asphyxiation, fire, explosion, injury, or death.
WARNING
!
Flue Discharge Area
Important! Do not
install gas piping or
electrical wiring above
the flue discharge
area!
Manifold/Control
End Down
SIDE VIEW
20˚ - 35˚