Specifications

7

NBST27 Unvented Gas Log Set


           


Exception: 




The NBST27 unvented room heater is approved for instal-
lation into the following unvented fireplaces:
 
 
The NBST27 unvented room heater may also be installed
into a Ventless Firebox Enclosure for Gas Fired Decorative
Type Unvented Room Heaters per IAS Requirement No. 2-
97 ANSI Z21.91-2001 (typically referred to as a "Universal
Firebox"), as long as firebox hearth dimensions meet the
minimum hearth dimensions shown below.
32”
2156O”
2156O”
FP2361
fireplace dims
Figure 2 -
Hearth Minimum Dimensions for Solid
Fuel Burning Fireplaces and UL127
Factory Built Fireplaces
FP2361




The following are guidelines for placing a gas log set in
a fireplace that has a restrictive barrier along the bottom
front opening of the fireplace. Some examples of barri-
ers are glass/screen door frames and sunken/recessed
fireplaces.
 
  
No Restriction 21Z\x”
1/2” to 1Z\x” 25Z\v”
Greater than 1Z\x” to 3” 27Z\v”
Greater than 3” *
*Any barrier greater than 3” placed in front of the gas log
set is not recommended by the manufacturer.
 Non combustible material such as refractory brick
may be used to line the floor of the fireplace in order to raise
the height of the gas log set in relation to a restrictive barrier.
If the unit is raised, the minimum height dimension listed in
the homeowner’s manual must not be exceeded.
 If the log set is equipped with a remote receiver, a
restrictive barrier may reduce the battery life by increasing
the ambient temperature inside the fireplace. Placement
of the receiver outside of the fireplace will extend the
battery life.
FP2362
fireplace barrier
X
Glass door frames
with adjustable
louvers should have
the louvers fully
open while the unit
is in operation
Height of restrictive barrier
caused by glass door frames,
recessed fireplaces, etc. from
the base or bottom surface of
the unit. (Refer to Table)
Refer to
Table
FP2362






Figure 3 -
Reference Drawing of NBST27 Log Set in an Enclosure