User Manual

Form 43471010
-4- Dec 2017
4.0) MINIMUM CLEARANCES TO COMBUSTIBLES
Minimum clearances to combustibles shall be measured from the outer surfaces as shown in the following
diagram. For reduced clearances below the heater, use the Deflector Kit (Part No. 43504010), described in
Section 6.1), and maintain the minimum clearances specified in the notes below. Follow the instructions
packaged with the kit for installation. Install the warnings card (ordered separately) and complete the blank
spaces using the clearances from combustibles table below. See Section 24 for a printed copy of the warnings
card.
MINIMUM CLEARANCES TO COMBUSTIBLES
Model No.
Mounted Horizontally
Angle Mounted at 45º
Sides
Ceiling
1
Below
2
Ends
45º Front
45º Rear
SIR 25
8”
4”
41” *
8”
30”
4”
SIR 35, 45
12”
4”
57” **
8”
40”
4”
* The clearance is 33” with deflector. ** The clearance is 42” with deflector / 30” side clearance with deflector.
1
The clearance is 12” when installed in an UNVENTED configuration in industrial and commercial installations.
2
IN CANADA, clearances below the heater are:
SIR25: 36” (27” with deflector);
SIR35/45: 48” (36” with deflector)
▲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:
1. 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.
2. The stated clearance to combustibles represents a surface temperature of 90 ºF (32 ºC) above room
temperature. Building materials with a low heat tolerance (such as plastics, vinyle siding, canvas, tri-ply, etc.)
may be subject to degradation at lower temperatures. It is the installer’s responsibility to assure that adjacent
materials are protected from degradation.