Procom QN300RYLA-W Determining FRESH-AIR Flow for Heater Location, Unusually Tight Construction

AIR FOR COMBUSTION AND VENTILATION

Confined and Unconfined Space

WARNING: This heater

shall not be installed in a confined

The National Fuel Gas Code, ANS

space or unusually

tight

con-

Z223.1 defines a confined space as a

struction unless provisions

are

space whose

volume is less than 50

provided for adequate combus-

cubic feet

per 1,000 Btu per hour

tion and ventilation air. Read the

(4.8 m3 per kw) of the aggregate

following instructions

to insure

input rating of all appliances installed

proper fresh air for this and other

in that

space and an unconfining

fuel-burning

appliances in your

space as a space whose volume is

home.

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

PROVIDING ADEQUATE

installed

in

that

space.

Rooms

communicating directly with the space

VENTILATION

in which the appliances are installed*,

through openings not furnished with

The following

are excerpts from

doors, are

considered a part of the

National

Fuel Gas Code, NFPA 54/

unconfined

space.

ANSZ 223.1,Section 5.3, Air for

Combustion and

Ventilation.

This heater shall not

be installed in

All spaces in homes fall into one of

a confined

space

or

unusually

tight

the

three

following

ventilation

construction

unless

provisions

are

classifications:

provided

for

adequate combustion

1.

Unusually Tight Construction

and ventilation air.

2.

Unconfined Space

3.

Confined Space

* Adjoining rooms are communicating

The information on pages 5 through 6

only if there are doorless passage-

will

help

you classify your space and

ways or

ventilation

grills

between

provide

adequate

ventilation.

them.

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 (6×10-11kg per pa - sec - m 2 ) 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.

If your home does not meet all of the three criteria above, proceed to Determining Fresh-Air Flow For Heater Location.

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	passageways
or ventilation	grills between			the rooms.		×
				×
1. Determine	the	volume of		the space (length		width height).
×		×
Length Width			Height=		cu.ft. (volume of space)
				×		×
Example: Space size 20ft. (length) 16ft.(width) 8ft. (ceiling height)=2560cu. ft. (volume of space)
If additional ventilation to adjoining room is						supplied with grills	or openings, add the volume	of these
rooms to	the	total volume of the space.

2.Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support. (volume of space)÷50 cu. ft.=(Maximum Btu/Hr the space can support)

Example: 2560 cu. ft. (volume of space)÷50 cu.ft.=51.2 or 51,200(maximum Btu/Hr the space can support)

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