Desa CDR3924NT - Manual (Page 9)

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INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
WARNING: Maintain the
minimum clearances. If possible,
provide greater clearances from
floor, ceiling and adjoining wall.
LOG SIZING REQUIREMENTS
Log Minimum Firebox
Size Height Depth Front Rear *
Width Width
24" 17" 14" 28" 20 1 /
4
"
Minimum Firebox with Blower
24" 17" 14" 34" 22 3 /
8
"
* Measured at 14" depth.
Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127-listed
manufactured fireplace or listed vent-free firebox.
Minimum Clearances For Side Combustible
Material, Side Wall and Ceiling
A. Clearances from the side of the fireplace
cabinet to any combustible material and wall
should follow diagram in Figure 4.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1 /
2
" from the wall. This combus-
tible material must be 4" from the side of the
fireplace cabinet (see Figure 4).
Note: When installing your gas logs into
a manufactured firebox, follow firebox
manufacturerʼs instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the fireplace opening
to the ceiling should not be less than 42 inches.
INSTALLATION
Continued
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16 inches from Side Wall
*
Example
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
Minimum Noncombustible Material
Clearances
If Not Using Mantel
Note: If using a mantel proceed to If Using Mantel.
If not using a mantel, follow the information on
this page.
You must have noncombustible material(s) above the
fireplace opening. Noncombustible materials (such as
slate, marble, tile, etc.) must be at least 1/2 inch thick.
With sheet metal, you must have noncombustible
material behind it. Noncombustible material must
extend at least 8" up. If noncombustible material is
less than 12", you must install the fireplace hood ac-
cessory. See Figure 5 for minimum clearances.
If Using Mantel
You must have noncombustible material(s) above
the fireplace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncombus-
tible material must extend at least 8 inches up.
If noncombustible material is less than 12", you
must install the fireplace hood accessory. Even if
noncombustible material is more than 12", you may
need the hood accessory to deflect heat away from
your mantel shelf. See Figure 5 and Figures 6 and
7, page 10, for minimum clearances.
IMPORTANT:
If you cannot meet these minimum
clearances, you must operate heater with chimney
flue damper open.
Noncombustible Requirements for
Material Distance (A) Safe Installation
12" or more
Noncombustible material
okay.
Between 8" Install fireplace hood
and 12" accessory (GA6050,
GA6052 or GA6053 see
Accessories, page 25).
Less than 8" Noncombustible material
must be extended to at
least 8". See Between 8"
and 12", above. If you
cannot extend material,
you must operate heater
with flue damper open.