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Form I-VR (10-14), P/N 205202 R14, Page 8
4.3 Clearances to
Combustibles
Required clearances depend on the size of the heater (BTUH input), the posi -
tion of the reflector, and the addition of an optional side shield on the rear side
of the heater. Refer to illustrations in
FIGURE 3
to define clearances.
The stated clearance to combustibles represents a surface temperature of
90°F (32°C) above room temperature. Building materials with a low heat tol -
erance (such as plastics, vinyl 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 not subject to degradation.
The clearances listed in the tables are installation requirements. In addition,
ANSI Z-223-1, Section 6.18, requires that signs be posted specifying the maxi -
mum permissible stacking heights to assure that the required clearances from
the heater to combustibles are maintained in areas where items are stored
under the heater.
Refer to Paragraph 1, Special Installations, for specific clearance requirements
for heaters installed in aircraft hangars and public garages.
FIGURE 3 - Clearance
Orientation
4. Dimensions, Configurations, and Clearances (cont’d)
 ­
€‚
€ƒ
*
If the heater is not vented to the outside of the building, the top clearance
to combustibles is 18” (457mm).
** Refer to Paragraph 6.2.4 for side shield installation.
Clearances to Combustibles
Size
Below
Top*
Horizontal Clearances
Vent
Burner
End
Heat
Exchanger
Bend (U or L)
Exhaust
End
50,
75,
100
inches
66 12 24 36 24 6
mm
1676 305 610 914 610 152
125,
150
inches
78 12 30 48 24 6
mm
1981 305 762 1219 610 152
175,
200
inches
84 12 30 48 24 6
mm
2134 305 762 1219 610 152
Size
With Reflector Positioned
0-30° 31-45°
0-30° with
Side Shield **
Front Rear Front Rear Front Rear
50,
75,
100
inches
30 30 48 18 36 12
mm
762 762 1219 457 914 305
125,
150
inches
42 42 66 32 42 12
mm
1067 1067 1676 813 1067 305
175,
200
inches
54 54 78 36 54 12
mm
1372 1372 1981 914 1372 305
5. Suspension
Requirements

Supporting structure must have a minimum load-carrying capacity of
200 lbs (91 kg). ( Do not suspend the heater from gas piping or electrical
conduit.)

Clearances to combustibles must be observed. See Paragraph 4.3.

Heater must be suspended by hanging chains. Chain must have a
minimum of 200 lbs (91kg) working load rating. Use either Option CK11
hanging chain kit which includes 50 ft of chain and 22 “S” hooks or
equivalent field-supplied chain and “S” hooks.
Chain length (including turnbuckle, if used) must be a minimum of 12
inches (305mm) at each suspension point. All chains must be plumb.
Model VR/GVR tubular radiant heaters must be suspended with chain
because the tubes will expand when heated. The overall length of a
straight system will expand approximately as shown in the table.
Model VR/GVR heaters are assembled as they are suspended. Suspen -
sion and field assembly are the responsibility of the installer. Comply with the
requirements listed here and the instructions in Paragraph 6.