Desa VS18NR - Manual (Page 8)

8 103449
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace
Noncombustible
Material Distance (A)
Requirements for Safe Installation
12" or more Noncombustible material OK.
Between 8" and 12" Install fireplace hood accessory (GA6050, GA6052
or GA6053 see
Accessories, page 23).
18" Model: Noncombustible material OK.
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.
INSTALLATION
Continued
If Using Mantel
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible 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 mate-
rial must extend at least 8 inches up. If
noncombustible material is less than 12",
you must install the fireplace hood acces-
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 below.
You must have noncombustible material(s)
above the fireplace opening. Noncombus-
tible 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 (for all models). If
noncombustible material is less than 12", you
must install the fireplace hood accessory. See
Figure 5 for minimum clearances.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.
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 fireplace opening is not
needed. Go to Installing Damper
Clamp Accessory for Vented
Operation, page 10
sory. 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 9 for minimum clearances.
IMPORTANT: If you cannot meet these
minimum clearances, you must operate
heater with chimney flue damper open. Go
to Installing Damper Clamp Accessory for
Vented Operation, page 10.