8
Heatilator • NBV4236I-B, NBV4842I-B Owner’s Manual • 2376-981 Rev. L • 5/22
MEASUREMENTS FROM
TOP EDGE OF THE OPENING
6 in.
18 in.
24 in.
30 in.
36 in.
48 in.
TO CEILING
42 in.
12 in.
123°F
115°F
120°F
132°F
145°F
170°F
180°F
APPLIANCE FRONT
APPLIANCE OPENING
110°F
HEARTH
(not required)
MANTEL
DECORATIVE BARRIER FRONTS
(NOT SHOWN)
SECTION 4.B.
FIXED GLASS ASSEMBLY
(NOT SHOWN)
SECTION 4.B.
FAN KIT
SECTION 6.A
CLEAR SPACE
SECTION 3.A.
CONTROL CAVITY
SECTION 3.K
Figure 3.2 General Operating Parts
B. General Operating Parts
C. Fuel Specifications
Figure 3.2 references the general operating parts of the
appliance and the section of this manual in which they are
discussed.
WARNING! Risk of Fire or Explosion!
Appliance must
be set up for compatible gas type!
• This appliance is designed to operate on either natural
gas or propane. Make sure the appliance is compatible
with gas type selected for installation site.
• Conversions must be made by a qualified service
technician using Hearth & Home Technologies specified
and approved parts.
Figure 3.3 Maximum Wall Surface Temperatures Above Appliance
E. Good Faith Wall Surface/TV Guidelines
Figure 3.3 shows the approximate wall surface temperatures
above the center of the appliance at various heights above
the appliance opening.
NOTICE:
Surface temperatures listed above are taken with
a temperature measuring probe as prescribed by the test
standard used for appliance certification. Temperatures on
walls or mantels taken with an infrared thermometer may
yield increased temperatures of up to 30
°
F (17
°
C)
or
more depending on the thermometer settings and material
characteristics being measured.
D. Wall and Mantel Temperatures
ANSI/CSA Standards
The American National Standards Institute (ANSI) and
Canadian Standards Association (CSA) write the safety
and performance standards to which all gas fireplaces
are tested. The following are the allowable temperatures
around and on a gas fireplace per the ANSI/CSA
standards:
Combustible Mantel and Surfaces around a Fireplace
The allowable temperature rise above ambient is 117
°F for all exposed combustible surfaces around the
fireplace, including the mantel, when installed according
to the installation instructions. Non-combustible surfaces
and mantels do not have a maximum temperature limit;
however the installation instructions must still be followed
for any restrictions on placement of non-combustible
materials on or around the fireplace.
Example: The mantel above a fireplace in a room
that is 70 °F is allowed to reach but not exceed
187°F (70 °F+117 °F = 187 °F).