Desa HDFB32C User Manual

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113900-01D6
AIR FOR COMBUSTION
AND VENTILATION
Continued
WARNING: If the area in
which the rebox and gas log
heater may be operated is
smaller than that dened as
an unconned 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 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoin-
ing unconned space. When ventilating to
an adjoining unconned space, you must
provide two permanent openings: one within
12" of the ceiling and one within 12" of the
ooronthewallconnectingthetwospaces
(see options 1 and 2, Figure 4). You can also
removedoorintoadjoiningroom(seeoption
3, Figure 4). Follow the National Fuel Gas
Code ANSI Z223.1/NFPA 54, Section 5.3, Air
for Combustion and Ventilationforrequired
size of ventilation grills or ducts.
Figure 4 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
3. Add the Btu/Hr of all fuel burning appliances
in the space.
Vent-free heater __________ Btu/Hr
Gas water heater* __________ Btu/Hr
Gas furnace __________ Btu/Hr
Vented gas heater __________ Btu/Hr
 Gasreplacelogs __________ Btu/Hr
Other gas appliances* + ________ Btu/Hr
Total = ________ Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
Example:
Gas water heater _________ Btu/Hr
 Vent-freereplace + ________ Btu/Hr
Total = ________ Btu/Hr
4. Compare the maximum Btu/Hr the space
can support with the actual amount of Btu/Hr
used.
_______ Btu/Hr (maximum the space can
support)
_______ Btu/Hr (actual amount of Btu/Hr
used)
Example: 51,200 Btu/Hr (maximum the
space can support)
79,000 Btu/Hr (actual amount of
Btu/Hr used)
Thespaceintheaboveexampleisaconned
space because the actual Btu/Hr used is more
than the maximum Btu/Hr the space can sup-
port. You must provide additional fresh air. Your
options are as follows:
A. Rework worksheet, adding the space of an
adjoiningroom.Iftheextraspaceprovides
anunconnedspace,removedoortoadjoin-
ing room or add ventilation grills between
rooms. See Ventilation Air From Inside
Building below.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors.
C. Install a lower Btu/Hr heater, if lower
Btu/Hrsizemakesroomunconned.
If the actual Btu/Hr used is less than the
maximum Btu/Hr the space can support, the
spaceisanunconnedspace.Youwillneed
no additional fresh air ventilation.
40,000
39,000
79,000

Desa HDFB32C Specifications

General

Brand	Desa
Model	HDFB32C
Category	Indoor Fireplace
Language	English