Form #43219040
Oct 2013
11) VENTILATION
Where unvented infrared heaters are used, natural or mechanical means shall be provided to supply and exhaust
at least 4 cfm per 1000 Btu per hr input of installed heaters.
Exhaust openings for removing flue products shall be above the level of the heaters.
This heater requires ventilation in the building to dilute the products of combustion and provide fresh air for
efficient combustion. Power ventilation is recommended and the minimum vent flow required is as follows:
RD030, RD033, RD035
140 cfm
RD100
400 cfm
RD040
160 cfm
RD120
480 cfm
RD060, RD066, RD070
280 cfm
RD132, RD140
560 cfm
RD080
320 cfm
RD160
640 cfm
If gravity ventilation is used, the required square feet of inlet and outlet vent area (depending on height and
temperature difference) is as follows:
RD030, RD033, RD035
0.49 s/f
RD100
1.48 s/f
RD040
0.57 s/f
RD120
1.72 s/f
RD060, RD066, RD070
0.98 s/f
RD132, RD140
1.97 s/f
RD080
0.98 s/f
RD160
2.30 s/f
The General Ventilation Rules outlined in ASHRAE GUIDE AND DATA BOOK should be observed when locating
vents. Exhaust vents must be located at the highest point above and in the vicinity of the heaters and the inlet
vents must be located below the level of the heaters. Inlet openings in the building should be well distributed 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 the function simultaneously or allow control of exhausters to humidistat.
12) LIGHTING AND SHUTDOWN INSTRUCTIONS
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