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SECTION 3: C
RITICAL
 C
ONSIDERATIONS
  
3
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Required Clearances to Combustibles
Clearances are the required distances that 
combustible objects must be away from the heater to 
prevent serious fire hazards. Combustibles are 
materials, that may catch on fire and include common 
items such as wood, paper, rubber, fabric, etc. 
Maintain clearances to combustibles at all times 
for safety.
Clearances for all heater models are located on the 
burner of the heater and on Page 3, Figure 1 through 
Page 6, Figure 10
 in this manual. Check the 
clearances on each burner for the model heater 
being installed to make sure the product is suitable 
for your application and the clearances are 
maintained. Read and follow the safety guidelines 
below:
• Keep gasoline or other combustible materials 
including flammable objects, liquids, dust or 
vapors away from this heater or any other appli-
ance.
• Maintain clearances from heat sensitive material, 
equipment and workstations.
• Maintain clearances from vehicles parked below 
the heater.
• Maintain clearances from swinging and overhead 
doors, overhead cranes, vehicle lifts, partitions, 
storage racks, hoists, building construction, etc.
• In locations used for the storage of combustible 
materials, signs must be posted to specify the 
maximum permissible stacking height to maintain 
required clearances from the heater to the com-
bustibles. Signs must be posted adjacent to the 
heater thermostat. In the absence of a thermo-
stat, signs must be posted in a conspicuous 
location.
• Consult local Fire Marshal, Fire Insurance Carrier 
or other authorities for approval of proposed 
installation when there is a possibility of exposure 
to combustible airborne materials or vapors.
• Hang heater in accordance to the minimum sus-
pension requirements on Page 14, Figure 12.
• If the radiant tubes must pass through the building 
structure, be sure that adequate sleeving and fire 
stop is installed to prevent scorching and/or fire 
hazard.
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream 
from where the burner and burner tube connect.
WARNING
Fire Hazard
Some objects will catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapors the
required clearances to combustibles away from heater.
Failure to follow these instructions can result in death,
injury or property damage.
FIGURE 1: STANDARD REFLECTOR
(inches)
(centimeters)
Model
A
B
C
D
A
B
C
D
TF-120
6
35
63
35
16
89
161
89
TF-160
6
38
66
38
16
97
168
97
TF-200
6
40
71
40
16
102
181
102
TF-250
6
46
77
46
16
117
196
117
TF-300
6
50
80
50
16
127
204
127
TF-350
8
52
82
52
21
133
209
133
TF-380
8
52
82
52
21
133
209
133
A
C
D
B