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PrOVISIONS FOr ADeQuATe cOMBuSTION & VeNTILATION AIr
This heater shall not be installed in a confined space unless provisions
are provided for adequate combustion and ventilation air.
A confined space is an area with volume less than 50 cubic feet per 1,000
Btuh of the combined input rates of all appliances drawing combustion
air from that space. Small areas such as equipment rooms are confined
spaces. Furnaces installed in a confined space which supply heated air
to areas outside the space must draw return air from outside the space
through tightly sealed return air ducts. A confined space must have 2
openings into the space for combustion air. One opening must be within
12 inches of the ceiling and the other must be within 12 inches of the
floor. The required sizing of these openings is determined by whether
inside or outside air is used to support combustion, the method by which
the air is brought to the space (vertical or horizontal duct) and by the
total input rate of all appliances in the space.
unusually Tight construction
The air that leaks around doors and windows may provide enough fresh
air for combustion and ventilation. However, in buildings of unusually
tight construction, you must provide additional fresh air.
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 one perm or
less with openings gasketed or sealed, and
b. Weatherstripping 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, be-
tween wall-ceiling joints, between wall panels, at penetrations for
plumbing, electrical, and gas lines, and at other openings.
If your home meets all of the three criteria above, you must provide
additional fresh air.
If the area in which the heater may be operated is smaller than that
defined as an unconfined space or if the building is of unusually tight
construction, provide adequate combustion and ventilation air by
one of the methods described in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Air for Combustion and Ventilation, or applicable
local codes.
Minimum Dimensions For Solid Fuel Burning Fireplaces uL127
Factory Built Fireplaces (Figure 2)
Model
A
VFSR-16
18"
VFSR-18
17"
VFSR-24
23"
VFSR-30
26"
The dimensions shown and defined in the fireplace manufacturer's
instructions are minimum clearances to maintain in installing this
heater. Left and right clearances are determined when facing the
front of the heater.
Glass Doors
Make sure that glass doors are open during all operations of
the logset. The opening of the glass door frame should be the
dimension used for the minimum front opening of the firebox.
Follow these instructions to ensure safe installation.
Failure to follow instructions exactly can create a fire hazard.
28682-1-0811
wArNING
cLeArANceS
B
c
11 1/2"
24"
14"
28"
14"
30"
14"
34"
FIREPLACE
H
W
Example of Large Room with 1/2 Wall divider.
The following formula can be used to determine the maximum heater
rating per the definition of unconfined space:
Btu/Hr =
If the area in which the heater may be operated is smaller than that defined
as an unconfined space, provide adequate combustion and ventilation
air by one of the methods described in the National Fuel Gas Code,
ANSI Z223.1, NFPA54.
Adhere to all codes, or in their absence, the latest edition of THE
NATIONAL FUEL GAS CODE ANSI Z223.1/NFPA54 which can be
obtained from:
American National Standards Institute National Fire Protection Associa-
tion, Inc.
11 West 42nd St.
New York, NY 10018
D
18"
17"
18"
20"
DIVIDER
L
1
Figure 1
(L
+ L
)FT x (w)FT x (H)FT
1
2
50
Batterymarch Park
Quincy, MA 02269
Figure 2
L
2
x 1000
Page 9
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