Procom ML300HGA Fresh AIR for Combustion and Ventilation, Producing Adequate Ventilation

FRESH AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater shall not be installed in a

confined space		or	unusually
tight construction			unless
provisions	are	provided		for
adequate	combustion			and
ventilation	air .	Read		the
f o l l o w i n g	i n s t r u c t i o n s			t o

insure proper fresh air for this

and other fuel-burning appliances in your home.

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 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-m2) 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 6.

If your home does not meet all of the three criteria above, see Determining Fresh-Air Flow for Heater Location, page 5.

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 m3 per kw) of the aggregate 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 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 installed*, through openings not furnished with doors, are considered a part of the unconfined space.

This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air.

* A d j o i n i n g r o o m s a r e communicating only if there are doorless passageways or ventilation grills between them.

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

×

width

height).

the space (length

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)

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined 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, ANS Z223.1, Section 5.3
or applicable	local	codes.

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