WARNING
!
Failure to comply with the stated clearances to combustibles may result
in personal injury, property damage, and/or death.
Chart 2.1
•
Clearances to Combustibles in Inches
(see Figure 2.1 for Mounting Angles)
Model Number
(Length) - MBH
Mounting
Angle*
Sides
Front
Behind
Top**
Below
65,000 and 75,000 BTU/h MODELS
CL3 (30, 40) - 65, 75 [N, P]
0°
16
16
6
43
45°
36
9
10
33
with 1 side shield
0°
33
9
6
43
with 2 side shields
0°
9
9
6
46
20 ft. from burner
0°
9
9
6
32
80,000 and 85,000 BTU/h MODELS
CL3 (30, 40, 50) - 80, 85 [N, P]
0°
16
16
6
43
45°
36
9
10
33
with 1 side shield
0°
33
9
6
43
with 2 side shields
0°
9
9
6
46
20 ft. from burner
0°
9
9
6
32
* Heaters mounted on an angle between 0° and 45° must maintain clearances posted for 0° or 45°,
whichever is greater.
NOTE
: Use high BTU output when determining clearances. The minimum end
clearance is 12”.
** In CNG maintenance facilities with less than 4 air changes per hour, a minimum distance of 18” from
the top of the heater to the ceiling is required. Consult the factory for more information.
0° Mounting Angle
45° Mounting Angle
0° Mounting Angle
with 1 Side Shield
(P/N: SSE)
0° Mounting Angle
with 2 Side Shields
(P/N: SSE)
Side
Side
Below
Top
Front
Behind
Below
Top
Front
Behind
Below
Top
Side
Side
Below
Top
Figure 2.1
•
Mounting Angles
9
CL3
Series
2.0
Safety
•
Clearances to Combustibles
In locations used for the storage of combustible materials, signs must be posted to specify the
maximum permissible stacking height to maintain the required clearances from the heater to the
combustibles. Signs must either be posted adjacent to the heater’s thermostat or in a conspicuous
location.
The stated clearance 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 ensure
that adjacent materials are protected from degradation.
