Minimum Clearances To Combustibles - Space-Ray LTU SERIES Installation And Operation Instructions Manual
Ltu / lts series infrared radiant tube heater
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MINIMUM CLEARANCES TO COMBUSTIBLES
Minimum clearances to combustibles shall be measured from the outer surfaces as shown in the following diagram:
Horizontal
Model No.
LTS, LTU 40, 50
LTS, LTU 60, 75
LTS, LTU 80, 90
LTS, LTU 100
LTS, LTU 110, 120, 125, 130
LTS, LTU 140, 150, 160, 175
LTS, LTU 180, 200, 225, 250
When used indirect vented, minimum clearance for CEILING must be: 12" for LTU, LTS 40-75 and 18" for LTU, LTS 80-
250. If optional corner reflectors are not used, the clearance must be 18".
Minimum clearance BELOW reduces to 72" once you are 20 ft. downstream from the control box.
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
Sides
Ceiling
27"
6"
27"
6"
52"
6"
66"
6"
66"
6"
84"
6"
84"
6"
–30–
45° Angle (Maximum)
Below
Ends
45º Front
40"
30"
60"
30"
84"
30"
88"
40"
101"
40"
106"
48"
132"
48"
Angle Mounted at 45º
45º Rear
48"
12"
48"
12"
52"
12"
66"
20"
66"
20"
84"
24"
84"
24"
Form #43155260
Mar–05
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