Series UAG
Page 8
Nov 11, 2015
Clearance To Combustibles
A general clearance of 18” (0.5 m) in every direction
is recommended (for servicing only) around each
burner 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 installed with 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.
It is important to observe minimum clearance to combustibles at all times to avoid any possibility of
property damage or personal injury. Clearances must be maintained from vehicles parked beneath heaters.
Signs should be posted identifying any possible violation of the clearance distances from the heater in
vehicle areas. Also maximum allowable stacking height in storage areas should be identified with signs or
appropriate markings. Page 10 shows minimum clearance to combustible materials.
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.
Caution:
In all cases, the minimum hanging height from the floor shall be 8’
