Desa HD18NB Owner's Operation And Installation Manual page 11

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NOTICE: Surface temperatures
of adjacent walls and mantels be-
come hot during operation. Walls
and mantels above the firebox
may become hot to the touch.
If installed properly, these tem-
peratures meet the requirement
of the national product standard.
Follow all minimum clearances
shown in this manual.
NOTICE: If your installation does
not meet the minimum clear-
ances shown, you must do one
of the following:
• raise the mantel to an accept-
able height
FLOOR CLEARANCES
A. If installing appliance on the floor level,
you must maintain the minimum distance
of 14" to combustibles (see Figure 7).
B. If combustible materials are less than 14"
to the fireplace, you must install appliance
at least 5" above the combustible flooring
(see Figure 8).
Figure 7 - Minimum Fireplace Clearances
If Installed at Floor Level
Figure 8 - Minimum Fireplace Clearances
Above Combustible Flooring
124531-01A
INSTALLATION
Continued
Combustible
Material
14"
Min.
Noncombustible Material
Hearth
Combustible
Material
5"
Min.
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INSTALLING DAMPER CLAMP
ACCESSORY FOR VENTED
OPERATION
Note: When used as a vented heater, ap-
pliance must be installed only in a solid-fuel
burning fireplace with a working flue and con-
structed of noncombustible material.
For Massachusetts Residents Only: Instal-
lation of this gas log set as a vented appliance
in the Commonwealth of Massachusetts re-
quires the damper be permanently removed
or welded in the fully open position.
If your heater is a manually-controlled model,
you may use this heater as a vented product.
There are three reasons for operating your
heater in the vented mode.
1. The fireplace does not meet the clearance
to combustibles requirements for vent-
free operation.
2. State or local codes do not permit vent-
free operation.
3. You prefer vented operation.
If reasons number 1 or 2 above apply to you,
you must permanently open chimney flue
damper. You must install the damper clamp
accessory (to order, see Accessories, page
27). This will insure vented operation (see Fig-
ure 9,). The damper clamp will keep damper
open. Installation instructions are included
with clamp accessory.
Damper
Clamp
Damper
Clamp
Damper
Masonry Fireplace
Figure 9 - Attaching Damper Clamp
Damper
Damper
Manufactured Fireplace
11

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