Section 4: Clearances To Combustibles; Required Clearances To Combustibles; Clearances To Combustibles; Figure 4: Installation Clearances And Clearances To Combustibles - Addison UHA 150 Installation, Operation & Service Manual

SECTION 4: CLEARANCES TO COMBUSTIBLES

4.1 Required Clearances To Combustibles

WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the required clearances to
combustibles away from heater.
Some objects can catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property damage.
Clearances are the required distances that
combustible objects must be away from the heater
to prevent serious fire hazards. Combustibles are
materials that 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
serial plate of the heater and throughout the manual.

Figure 4: Installation Clearances and Clearances to Combustibles

Roof Terminal
24" for
Wall
adequate
Terminal
air flow access
axial fan.
20' (6.0 m) - 30' (9.1 m)
Max. Mounting Height*
* 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.
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.
Installation Clearances
(Optional separated
combustion concentric
venting shown.)
Top
10'
(3 m)
SECTION 4: C
Check the clearances on the serial plate 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 material
including flammable objects, liquids, dust or
vapors away from this heater or any other
appliance.
• The stated clearances to combustibles
represents a surface temperature of 90° F
(50° C) above room temperature. Building
materials with a low heat tolerance (such as
plastics, vinyl siding, canvas, tri-ply, etc) may be
subject to degradation at lower temperatures. It
is the installer's responsibility to assure that
adjacent materials are protected from
degradation.
• 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.

4.2 Clearances To Combustibles

Clearances must be as indicated on Page 7 , Figure
4. If clearances to combustibles are not indicated,
then installation clearances apply.
Clearances to Combustibles
6"
(15 cm)
Clearance to Vent: 2" (5 cm)
**31" (79 cm) minimum is necessary
for servicing.
TO
LEARANCES COMBUSTIBLES
6"
(15 cm)
31"**
(79 cm)
3"
(8 cm)
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