Series TA/TX/TXR
Page 9
Jan 07, 2015
Clearance To Combustibles
A general clearance of 18” (0.5 m) in every direction
is recommended for servicing only around each
Burner, Vacuum Pump, and End Vent Cap air supply (at the far end of each Radiant Branch) also to
ensure adequate air flow in and around the Heating System.
In addition to this it is very important to observe the minimum clearance to combustibles at all
times to avoid any possibility of property damage or personal injury.
WARNING
Clearances as marked on the heater body must be maintained from vehicles parked beneath. Signs
should be posted identifying any possible violation of the clearance distances from the heater in all
vehicle areas.
Maximum allowable stacking height in storage areas should be identified with signs or appropriate
markings adjacent to the thermostat or in a conspicuous location.
Table 2 lists the minimum clearance to combustible materials for various installation configurations. Note
that standard clearances also apply to installation above T-bar ceilings and above decorative grills.
Additional clearance may be required for glass, painted surfaces and other materials which maybe
damaged by radiant or convective heat.
Combustible materials are considered to be wood, compressed paper, plant fibres, plastics, Plexiglas or
other materials capable of being ignited and burned. Such materials shall be considered combustible
even though flame-proofed, fire-retardant treated or plastered.
Elbows and U-bends are un-heat treated aluminized material and are typically installed without reflectors.
Reflector miter kits are available for U-bends and elbows.
Adequate clearance to sprinkler heads must be maintained.
The stated clearance to combustibles represents a surface temperature of 90°F (50°C) above room
temperature. Building materials with low heat tolerance
(such as plastics, vinyl siding, canvas, tri-ply,
etc…)
maybe subject to degradation at lower temperatures.
It is the installer’s responsibility to assure
that adjacent materials are protected from degradation.
Note 1:
Bottom Shields are approved for all burner sizes. The “below” clearance (dimension C in Table 2)
may be reduced by 25% when an approved Bottom Shield is used.
Note 2:
Reduced clearances downstream from the burner are approved for all configurations. Dimensions “B”,
“C”, and “D” in Table 2 can be reduced for locations 25' (7.6 m) or more downstream from a burner,
before the next burner, maximum reduction is 50%
