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VFF Vent Free Fireplace System
Unusually tight construction is defined as construction
where:
a. walls and ceilings exposed to the outside atmosphere
have a continuous water vapor retarder with a rating of
1 perm (6 x 10
kg per pa/sec-m
11
gasketed or sealed, and
b. weather stripping 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, electrical and gas
lines and other openings.
The following formula can be used to determine the maxi-
mum heater rating per the definition of unconfined space:
BTU/Hr = (L
+ L
1
Consider two connecting rooms with an open area
between, with the following dimensions:
L
= 15
/
Ft., L
= 12 Ft., W = 12 Ft., H = 8 Ft.
1
1
2
2
BTU/Hr = (15
If there were a door between the two rooms the calculation
would be based only on the room with the heater.
BTU/Hr = (15
Figure 4. Combustion Air Calculation
) or less with openings
2
) Ft x (W) Ft x (H) Ft
2
50
/
+ 12) x (12) x (8)
1
2
50
/
) x (12) x (8)
1
2
50
Counter
Fireplace
H
W
Monessen • VFF 32/36 Owner Manual • 20308184 • Rev F • 02/19
FIREPLACE INSTALLATION
FIREPLACE LOCATION
Carefully select the best location for installation of your
unvented fireplace. The following factors should be taken
into consideration.
•
Clearance to side wall, ceiling, woodwork and
window or other combustibles. Refer to "Clearances"
section. Minimum clearances to combustibles must
be maintained.
•
Location must not be affected by drafts caused by
kitchen exhaust fans, ceiling fans, return air registers
for forced air furnaces / air conditioners, windows or
doors.
•
Installation must provide adequate ventilation and
combustion air.
•
DO NOT INSTALL THESE MODELS IN A BED-
ROOM OR BATHROOM.
•
Location should be out of high traffic areas and
away from furniture and draperies due to heat
from firebox.
•
Never obstruct the front opening of the unvented
fireplace or restrict the flow of combustion and ven-
tilation air.
•
Minimize modifications to existing construction. Refer
to Figure 5 below for location suggestions.
•
Do not install in the vicinity where gasoline or other
flammable liquids may be stored. The unvented fire-
box must be kept clear and free from the combustible
materials.
Figure 5. Possible Fireplace Loca-
tions
FP2440
fireplace locations
9
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