Desa VyS18NC - Manual (Page 9)

www.desatech.com 124452-01A 9
INSTALLATION AND CLEARANCES
(Vent-Free Operation Only)
WARNING: Maintain the
minimum clearances. If you can,
provide greater clearances from
floor, ceiling and adjoining wall.
Minimum Fireplace Clearance to
Combustible Materials
Side Wall 16", Ceiling 42", Front 36"
Minimum Firebox Size
Height 17", Depth 14", Front Width 24",
Rear Width 20" (measured at 14" depth).
Carefully follow instructions below. This
will ensure safe installation into a masonry,
UL127-listed manufactured fireplace or certi-
fied vent-free firebox.
Minimum Clearances For Side
Combustible Material, Side Wall and
Ceiling
A. Clearances from side of 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 com-
bustible 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".
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
*
Example
INSTALLATION
Continued
NOTICE: Manual control heaters
may be used as a vented product.
If so, you must always run heater
with chimney flue damper open. If
running heater with damper open,
noncombustible material above fire-
place opening is not needed. Go to
Installing Damper Clamp Accessory
for Vented Operation, page 11.
Minimum Noncombustible Material
Clearances
If Not Using Mantel
Note: If using a mantel, proceed to If Using
Mantel, page 10. If not using a mantel, follow
the information below.
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. See Figure 5 for minimum clearances.
Noncombustible
Material
Requirements for
Distance (A) Safe Installation
12" or more Noncombustible material okay.
Between 8" and 12" Noncombustible material okay.
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.
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace