Fresh Air For Combustion And Ventilation; Determining Fresh-Air Flow For Heater Location - Procom WZN18TLA Owner's Operation And Installation Manual

FRESH AIR FOR
COMBUSTION AND
VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read
the following instructions to
insure proper fresh air for this
and other fuel-burning appli-
ances in your home .
Today's homes are built more energy ef-
ficient than ever. New materials, in-
creased insulation, and new construction
methods help reduce heat loss in homes.
Home owners weather strip and caulk
around windows and doors to keep the
cold air out and the warm air in. During
heating months, home owners want their
homes as airtight as possible.
While it is good to make your home en-
ergy efficient, your home needs to
breathe. Fresh air must enter your home.
All fuel-burning appliances need fresh air
for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers,
and fuel burning appliances draw air from
the house. To operate you must provide
adequate fresh air for these appliances.
This will insure proper venting of vented
fuel-burning appliances.

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space *
Use this worksheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passage
ways or ventilation grills between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ___________________ cu. ft. (volume of space)
Example: Space size20ft. (length) x 16ft(width) x 8ft.(ceiling height)=2560cu.ft.(volume of space)
PRODUCING ADEQUATE
VENTILATION
The following are excerpts from
National
Fuel Gas Code. NFPA 54/ANS Z223.
1, Section 5.3. Air for Combustion and
Ventilation.
All spaces in homes fall into one of
the three following ventilation
classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 through 6
will help you classify your space and
provide adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However,
i n b u i l d i n g s o f u n u s u a l l y t i g h t
construction, you must provide addi-
tional fresh air.
Unusually tight construction
is defined as construction
where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous wa-
ter vapor retarder with a rating of one
perm (6 x 10 kg per pa-sec-m
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with openings gasketed or sealed and
b. whether stripping has been added on
windows that can opened and doors.
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, be-
tween wall panels, at penetrations for
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plumbing, electrical, and gas lines,and
at other openings.
If your home meets all of the three
criteria above, you must provide addi-
tional fresh air. See Ventilation Air From
Outdoors, pages 5 and 6.
If your home does not meet all of the
three criteria above, see Determining
Fresh-Air Flow for Heater Location.
Confined and
Unconfined Space
The National Fuel Gas Code ANS
Z223.1 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 rat-
ing of all appliances installed in that
space and an unconfined space as a
space whose volume is not less than
50 cubic feet per 1,000 Btu per hour
(4.8 m per kw) of the aggregate input
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rating of all appliances installed in that
space. Rooms communicating directly
with the space in which the appliances
are installed*, through openings not fur-
nished with doors, are considered a
part of the unconfined space.
This heater shall not be installed in a
) or less
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confined space or unusually tight con-
struction unless provisions are provided
for adequate combustion and ventila-
tion air.
*Adjoining rooms are communicating
only if there are doorless passageways
or ventilation grills between them.