SECTION 4: C
LEARANCES
TO
COMBUSTIBLES
7 of 51
SECTION 4: CLEARANCES TO COMBUSTIBLES
4.1 Re
q
uired Clearances To Combustibles
Clearances are the req
u
ired distances that
comb
u
stible objects m
u
st be a
w
ay from the heater
to prevent serio
u
s fire hazards. Comb
u
stibles are
materials that catch on fire and incl
u
de common
items s
u
ch as
w
ood, paper, r
u
bber, fabric, etc.
Maintain clearances to comb
u
stibles at all times for
safety.
Clearances for all heater models are located on the
serial plate of the heater and thro
u
gho
u
t the man
u
al.
Check the clearances on the serial plate to make
s
u
re the prod
u
ct is s
u
itable for yo
u
r application and
the clearances are maintained. Read and follo
w
the
safety g
u
idelines belo
w
:
• Keep gasoline or other comb
u
stible material
incl
u
ding flammable objects, liq
u
ids, d
u
st or
vapors a
w
ay from this heater or any other
appliance.
• The stated clearances to comb
u
stibles
represents a s
u
rface temperat
u
re of 90° F (50°
C) above room temperat
u
re. B
u
ilding materials
w
ith a lo
w
heat tolerance (s
u
ch as plastics, vinyl
siding, canvas, tri-ply, etc) may be s
u
bject to
degradation at lo
w
er temperat
u
res. It is the
installer’s responsibility to ass
u
re that adjacent
materials are protected from degradation.
• Cons
u
lt local Fire Marshal, Fire Ins
u
rance Carrier
or other a
u
thorities for approval of proposed
installation
w
hen there is a possibility of
expos
u
re to comb
u
stible airborne materials or
vapors.
4.2 Clearances To Combustibles
Clearances m
u
st be as indicated
on Page 7, Figure
4
. If clearances to comb
u
stibles are not indicated,
then installation clearances apply.
Fi
g
ure 4: Installation Clearances and 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.
6"
(15 cm)
31"**
(79 cm)
3"
(
8
cm)
6"
(15 cm)
Clearances to Combustibles
24" for
ade
q
uate
air flow access
axial fan.
10
'
(3 m)
W
all
Terminal
Roof Terminal
Top
20
'
(6.0 m) - 30
'
(9.1 m)
Max. Mounting Height*
Installation Clearances
(Optional separated
com
b
ustion concentric
v
enting shown.)
* Recommended mo
u
nting height varies
w
ith heater inp
u
t.
Heaters may be mo
u
nted 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) minim
u
m is necessary
for servicing.
The heater m
u
st al
w
ays be installed at least 6' (2 m) above the floor.
The vent pipe m
u
st have clearance from comb
u
stibles by 2" (5 cm).
If installed at lo
w
levels
w
here individ
u
als can come in contact
w
ith hot heat
exchanger components, adeq
u
ate g
u
arding m
u
st be provided.
