Specifications

8

NBST27 Unvented Gas Log Set

    Figures 4 through 10    
      
         






The sides of the fire-
place opening must be at least 1C\v" from any combustible
wall. The ceiling must be at least 42" from the top of the
fireplace opening. The wall parallel to the side of the heater
must be at least 36” from the side of the heater. Refer to
your firebox owners manual for more information.
42”
36”
36”
16M”
FP2363
clearances
Figure 4 -
Sidewall and Ceiling Clearances
FP2363

1. If installing unit into an unvented firebox, minimum
required clearances listed in the firebox installation
manual must be met.
2. If installing unit into a vented firebox with a working
damper, minimum clearances shown in  through
10 must be met
3. If installing unit into a vented firebox with a damper that
is always open, no minimum clearances are required.


To install the gas logs into a fireplace with no wooden
mantel, shelf or other combustible projection above the
fireplace opening, measure the heat resistant material
height,  TABLE A.
Heat resistant materials such as slate and marble must 


IMPORTANT: If the unit is installed in a vented fireplace
and cannot meet these minimum clearances you must
operate the heater with chimney flue damper open. Refer
to “Installing Vented Applications” on .
FP2364
Heat resist matl
Measure This
Distance
Heat Resistant
Material
Heater in
Fireplace or
Firebox
FP2364
Figure 5 -
Measure Heat Re-
sistant Material

  
  
12” or more Hood not required
8” to less than 12” Extend heat resistant material to
12” or install hood. 
Less than 8” Extend heat resistant material to
at least 8” and install hood. 
 extend heat resistant material to
a height of at least 12”

