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FIREPLACE and HEARTH DIMENSIONS
This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fireplace,
vent free appliance, or in unvented firebox enclosures listed below. It has been design certified for
these installations.
Exception: DO NOT install this appliance in a factory-built fireplace that includes instructions stating
it has not been tested or should not be used with unvented gas logs.
IMPORTANT INFORMATION FOR THE
INSTALLATION OF THIS GAS LOG SET
Use manufacturer's installation and clearance require-
ments as defined in their manual.
The MJ Series unvented room heater is approved for
installation into the following unvented fireplaces:
GCUF Series Fireboxes Magnum36/42, Lo-Rider36 or
BUF
The MJ Series unvented room heater may also be installed
into an unvented 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�
19"
30"
Figure 1. Minimum Hearth Dimen-
sion
FP1994
Min. hearth dims
WARNING!
Barriers such as the bottom of a glass door
frame placed in front of a gas log set can change
the air flow characteristics of the fireplace
which in turn can cause the unit to overheat
and malfunction.
Monessen • MJ27NR-S/MJ27PR-S Owner's Manual • 20308677 • Rev B • 01/17
6
WARNING!
27"
14"
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).
"MOJO" Series Unvented Gas Log Sets
PLACEMENT IN A FIREPLACE WITH A
RESTRICTIVE BARRIER
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 barriers are
glass/screen door frames and sunken/recessed fireplaces.
Height of
Restriction (x)
No Restriction
0" to 1
⁄
"
1
2
Greater than 1
⁄
" to 3"
1
2
Greater than 3"
*Any barrier greater than 3" placed in front of the gas log
set is not recommended by the manufacturer�
Noncombustible 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.
NOTE: 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�
X
Figure 2. Reference Drawing of the MJ27 Log Set in an Enclosure
Minimum Depth of
Fireplace/Firebox
14"
17"
17"
*
T h e l o g s e t
should be placed
against or as
near as possible
to the rear wall
of the fireplace/
firebox.
Depth of fireplace/
firebox.
(Refer to Table).
FP1995
logset in enclosure
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