Section 3: Critical Considerations; Required Clearances To Combustibles; Figure 1: Standard Reflector - Roberts Gorden VANTAGE NP CTHN-125 Installation & Operation Manual

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 fire hazards. Combustible materials that may
catch fire 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
appliance.
• 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
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.

FIGURE 1: STANDARD REFLECTOR

• Consult local Fire Marshal, Fire Insurance Carrier
• Hang heater in accordance to the minimum
• If the radiant tubes must pass through the building
Model A B
CTHN-40 5 20
CTHN-60 5 27
CTHN-80 5 30
CTHN-100 5 32
CTHN-125 5 35
CTHN-150 5 39
CTHN-175 8 44
CTHN-200 8 47
required clearances from the heater to the
combustibles. Signs must be posted adjacent to
the heater thermostat. In the absence of a
thermostat, signs must be posted in a
conspicuous location.
or other authorities for approval of proposed
installation when there is a possibility of exposure
to combustible airborne materials or vapors.
suspension requirements on Page 10, Figure 12.
structure, be sure that adequate sleeving and fire
stop is installed to prevent scorching and/or fire
hazard.
(inches)
C D A
41 20 13
51 27 13
58 30 13
60 32 13
65 35 13
71 39 13
74 44 20
76 47 20
SECTION 3: C C
RITICAL ONSIDERATIONS
(centimeters)
B C D
51 104 51
69 130 69
76 147 76
81 152 81
89 165 89
99 180 99
112 188 112
119 193 119
3