Ac d b, Fireplace and hearth dimensions, Warning – Monessen Hearth NB24 User Manual
Page 9
81D0107
9
A
C
D
B
FIREPLACE AND HEARTH DIMENSIONS
Use manufacturer's installation and clearance requirements as defi ned in their manual.
The NB Series unvented room heater is approved for installation into the following unvented fireplaces:
GCUF Series Fireboxes Magnum36/42, Lo-Rider36
or BUF
The NB Series 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.
Figure 2 - Hearth Minimum Dimension
This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-
built fi replace, vent free appliance, or in listed ventless fi rebox enclosure. It has been
design certifi ed for these installations.
Exception: DO NOT install this appliance in a factory-built fi replace that includes
instructions stating it has not been tested or should not be used with unvented gas
logs.
W
ARNING
Model
A
B
C
D
NB18 with BO18(R,F)
26"
13"
18"
17"
NB24 with BO24(R,F)
29"
13"
22
1
/
4
"
17"
NB24 with BO30(R,F)
33"
13"
25
1
/
4
"
17"
Without front grate installed “B” will be 12
1
/
2
.