Space Ray DK Series - Manual (Page 14)

Form #43219010
Sept 2012
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:
DK30, DK33, DK35
140 cfm
DK100
400 cfm
DK40 160 cfm DK120 480 cfm
DK60, DK66, DK70 280 cfm DK132, DK140 560 cfm
DK80 320 cfm DK160 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:
DK30, DK33, DK35
0.49 s/f
DK100
1.48 s/f
DK40 0.57 s/f DK120 1.72 s/f
DK60, DK66, DK70 0.98 s/f DK132, DK140 1.97 s/f
DK80 0.98 s/f DK160 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
13