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AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater shall

not be installed in a room or

space unless the required vol-

ume of indoor combustion air

is provided by the method de-

scribed in the National Fuel Gas

Code, ANSI Z223.1/NFPA 54, the

International Fuel Gas Code, or

applicable local codes. Read the

following instructions to insure

proper fresh air for this and

other fuel-burning appliances

in your home.

Today’s homes are built more energy efficient

than ever. New materials, increased insulation

and new construction methods help reduce

heat loss in homes. Home owners weather

strip and caulk around windows and doors to

keep cold air out and warm air in. During heat-

ing months, home owners want their homes

as airtight as possible.
While it is good to make your home energy

efficient, your home needs to breathe. Fresh

air must enter your home. All fuel-burning ap-

pliances need fresh air for proper combustion

and ventilation.
Exhaust fans, fireboxes, clothes dryers and

fuel burning appliances draw air from house

to operate. You must provide adequate fresh

air for these appliances. This will insure proper

venting of vented fuel-burning appliances.

PROVIDING ADEQUATE

VENTILATION

The following are excerpts from National Fuel

Gas Code, ANSI Z223.1/NFPA 54, Air for

Combustion and Ventilation.
All spaces in homes fall into one of these three

following ventilation classifications:
1.  Unusually Tight Construction
2.  Unconfined Space
3.  Confined Space
The information on pages 7 through 9 will help

you classify your space and provide adequate

ventilation.

Unusually Tight Construction

The air that leaks around doors and windows

may provide enough fresh air for combustion

and ventilation. However, in buildings of un-

usually tight construction, you must provide

additional fresh air.
Unusually tight construction is defined as

construction where:

a. walls and ceilings exposed to the out-

side atmosphere have a continuous

water vapor retarder with a rating of

one perm (6 x 10

-11

kg per pa-sec-m

) or

less with openings 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 at other openings.

If your home meets all of the three criteria

above, you must provide additional fresh

air. See Ventilation Air From Outdoors,

page 9.

If your home does not meet all of the three

criteria above, proceed to Determining

Fresh-Air Flow for Heater Location, page 8.
Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/

NFPA 54 defines a confined space as a space

whose volume is less than 50 cubic feet per

1,000 Btu per hour (4.8 m

per kw) of the ag-

gregate input rating 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 rating of all appliances

installed in that space. Rooms communicating

directly with the space in which the appliances

are installed*, through openings not furnished

with doors, are considered a part of the un-

confined space.
* Adjoining rooms are communicating only if

there are doorless passageways or ventilation

grills between them.