Installation And Clearances - Desa CDR3924NT Owner's Operation And Installation Manual

INSTALLATION
Continued

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
4" 1"
Minimum Firebox with Blower
4" 1"
* 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 / " from the wall. This combus-
1
2
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
manufacturer's 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".
Example
*Minimum 16" from Side Wall
Figure 4 - Minimum Clearance for
Combustible to Wall
113183-01F
Depth Front Rear *
Width Width
14" 8" 0
14" 34" 
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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" 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
4
1/2" thick. With sheet metal, you must have non-
combustible material behind it. Noncombustible
/ "
3
material must extend at least 8" up. If noncombus-
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tible 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
Material Distance (A) Safe Installation
1" or more
Between 8"
and 1"
Less than 8"
*
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
Requirements for
Noncombustible material
okay.
Install fireplace hood
accessory (GA6050,
GA605 or GA6053 see
Accessories, page 5).
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.
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