FLAME-MAX UNVENTED (VENT-FREE) PROPANE/LP GAS LOG HEATER Manuals


VANGUARD FLAME-MAX™
UNVENTED PROPANE/LP GAS LOG HEATER
AIR FOR
stalled*, through openings not furnished
Example:
with doors, are considered a part of the
Gas water heater
40,000 Btu/Hr
COMBUSTION AND
unconfined space.
Vent-free heater       + 31,500 Btu/Hr
VENTILATION
Total                        = 71,500 Btu/Hr
* Adjoining rooms are communicating only
* Do not include direct-vent gas appli-
Continued
if there are doorless passageways or ventila-
tion grills between them.
ances. Direct-vent draws combustion
Unusually Tight Construction
air from the outdoors and vents to the
DETERMINING AIR FLOW
outdoors.
The air that leaks around doors and win-
FOR HEATER LOCATION
4.
Compare the maximum Btu/Hr the
dows may provide enough fresh air for
space can support with the actual
combustion and ventilation. However, in
Determining if You Have a
amount of Btu/Hr used.
buildings of unusually tight construction,
Confined or Unconfined Space
you must provide additional fresh air.
__________ Btu/Hr (maximum the
Use this work sheet to determine if you have
space can support)
Unusually tight construction is de-
a confined or unconfined space.
__________ Btu/Hr (actual amount of
fined as construction where:
Space:  Includes the room in which you
Btu/Hr used)
a.
walls and ceilings exposed to the
will install heater plus any adjoining rooms
Example: 51,200 Btu/Hr (maximum
outside atmosphere have a con-
with doorless passageways or ventilation
the space can support)
tinuous water vapor retarder with
grills between the rooms.
a rating of one perm (6x10-11 kg
71,500 Btu/Hr (actual amount of Btu/
1.
Determine the volume of the space
per pa-sec-m2) or less with open-
Hr used)
(length x width x height).
ings gasketed or sealed and
The space in the above example is a con-
Length x Width x Height =
b. weather stripping has been
fined space because the actual Btu/Hr used
__________ cu. ft. (volume of space)
added on openable windows and
is more than the maximum Btu/Hr the space
Example: Space size 20 ft. (length) x
doors and
can support. You must provide additional
16 ft. (width) x 8 ft. (ceiling height) =
c.
caulking or sealants are applied
fresh air. Your options are as follows:
2560 cu. ft. (volume of space)
to areas such as joints around
A. Rework worksheet, adding the space of
If additional ventilation to adjoining
window and door frames, be-
an adjoining room. If the extra space
tween sole plates and floors, be-
room is supplied with grills or open-
provides an unconfined space, remove
tween wall-ceiling joints, be-
ings, add the volume of these rooms to
door to adjoining room or add ventila-
the total volume of the space.
tween wall panels, at penetra-
tion grills between rooms. See Ventila-
tions for plumbing, electrical, and
2.
Divide the space volume by 50 cubic
tion Air From Inside Building, page 5.
gas lines, and at other openings.
feet to determine the maximum Btu/Hr
B. Vent room directly to the outdoors. See
the space can support.
If your home meets all of the three
Ventilation Air From Outdoors, page 5.
criteria above, you must provide ad-
_______________ (volume of space)
C. Install a lower Btu/Hr heater, if lower
ditional fresh air. See Ventilation Air
÷ 50 cu. ft. = (maximum Btu/Hr the
Btu/Hr size makes room unconfined.
From Outdoors, page 5.
space can support)
If the actual Btu/Hr used is less than the
Example:  2560 cu. ft. (volume of
If your home does not meet all of the
maximum Btu/Hr the space can support, the
space) ÷ 50 cu. ft. = 51.2 or 51,200
three criteria above, proceed to De-
space is an unconfined space. You will need
(maximum Btu/Hr the space can sup-
termining Air Flow For Heater Loca-
no additional fresh air ventilation.
port)
tion.
3.
Add the Btu/Hr of all fuel burning ap-
Confined and Unconfined Space
pliances in the space.
The National Fuel Gas Code (ANSIZ223.1,
Vent-free heater __________ Btu/Hr
1992 Section 5.3) defines a confined space
Gas water heater* ________ Btu/Hr
as a space whose volume is less than 50
Gas furnace _____________ Btu/Hr
cubic feet per 1,000 Btu per hour (4.8 m3 per
Vented gas heater _________ Btu/Hr
kw) of the aggregate input rating of all
Gas fireplace logs ________ Btu/Hr
appliances installed in that space and an
Other gas appliances* + ___ Btu/Hr
unconfined space as a space whose volume
Total                            = ___ Btu/Hr
is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 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 in-
4
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