Operating instructions
6
"MOJO" Series Unvented Gas Log Sets
This heater shall not be installed in a confined space or unusually tight construction unless provisions are
provided for adequate combustion and ventilation air.
, defines a confined space as a space whose volume
is less than 50 cubic feet per 1,000 BTU per hour (4.8 m
3
per kw) of the aggregate input rating of all appli-
ances installed in that space. An unconfined space is defined as a space whose volume is not less than 50
cubic feet per 1,000 BTU per hour (4.8 m
3
per kw) of the aggregate input rating of all appliances installed
in that space. Rooms communicating directly with the space in which the appliances are installed, through
openings not furnished with doors, are considered a part of the unconfined space.
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating
of 1 perm (6 x 10
11
kg per pa-sec-m
2
) or less with openings gasketed or sealed;
b) weather striping has been added on openable windows and doors, and
c) caulking or sealants are applied to areas such as joints around window and door frames, between sole
plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, elec-
trical, and gas lines, and at other openings.
The following formula can be used to determine the maximum heater rating per the definition
of unconfined space:
(L1 + L2) Ft x (W) Ft x (H) Ft
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1 = 15Z\x Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
(15Z\x + 12) x (12) x (8)
50
If there were a door between the two rooms the calculation would be based only on the room
with the heater.
(15Z\x) x (12) x (8)
50
x 1000
x 1000 = 52800 BTU/hr
x 1000 = 29,760 BTU/hr
BTU/hr =
BTU/hr =
BTU/hr =
FP2000
log clearances
W
H
Figure 1 -
Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace