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4.0)
MINIMUM CLEARANCES TO COMBUSTIBLES
Minimum clearances to combustibles shall be measured from the outer surfaces as shown in the following diagram:
Model No.
PTS/PTU 40/25
PTS/PTU 50/30
PTS/PTU 75/50
PTS/PTU 100/65
PTS/PTU 125/80
PTS/PTU 150/100
PTS/PTU 175/110
PTS/PTU 200/125
* When used indirect vented, minimum clearance for CEILING must be: 12" for PTS/PTU 50-75 and 18" for
PTS/PTU 100-200. If optional corner and u-bend reflectors are not used, the clearance must be 18".
** Maximum clearance below reduces to 72" once you are 20ft. downstream from the control box.
WARNING: Certain materials or objects, when stored under the heater, will be subjected to radiant heat and
could be seriously damaged. Observe the Minimum Clearances to Combustibles listed in the manual and on the
heater at all times.
NOTE: The clearances specified above must be maintained to combustibles and other materials that may be
damaged by temperatures 90ºF above ambient temperature. Clearances to combustibles are posted on the
control box. In areas used for storage of combustible materials where they may be stacked below the heater,
NFPA54 requires that the installer must post signs that will "specify the maximum permissible stacking height to
maintain the required clearances from the heater to combustibles." Space-Ray recommends posting these signs
adjacent to the heater thermostat or other suitable location that will provide enhanced visibility.
MINIMUM CLEARANCES TO COMBUSTIBLES
Mounted Horizontally
Ceiling *
Sides
27"
6"
27"
6"
27"
6"
66"
6"
66"
6"
84"
6"
84"
6"
84"
6"
–4–
Angle Mounted at
Below
Ends
45º Front 45º Rear
40"
30"
48"
40"
30"
48"
60"
30"
48"
88" **
40"
66"
101" **
40"
66"
106" **
48"
84"
106" **
48"
84"
106" **
48"
84"
45º
12"
12"
12"
20"
20"
24"
24"
24"
Form #43343530
JJuly 08
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