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UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
4
Figure 1: Installation Clearances and Clearances to Combustibles
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.
6"**
(15 cm)
31"
(79 cm)
3"
6"
(15 cm)
Clearances to Combustibles
24" for
adequate
air flow access
axial fan.
10'
(3 m)
Wall
Terminal
Roof Terminal
Top
20' (6.0 m) - 30' (9.1 m)
Max. Mounting Height*
Installation Clearances
(Optional separated
combustion concentric
venting shown.)
* Recommended mounting height varies with heater input.
Heaters may be mounted at a higher level if destratification
fans are installed.
Note: Venting directly from top of heater not applicable
on Models 150 - 400.
Clearance to Vent: 2" (5 cm)
**31" (79 cm) minimum is necessary
for servicing.
The heater must always be installed at least 6' (2 m) above the floor.
The vent pipe must have clearance from combustibles by 2" (5 cm).
If installed at low levels where individuals can come in contact with hot heat
exchanger components, adequate guarding must be provided.