Air For Combustion And Ventilation - Procom ML170EPC Owner's Operation And Installation Manual

AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight construc-
tion unless provisions are pro-
vided for adequate combustion
and ventilation air. Read the
following instructions to insure
proper fresh air for this and other
fuel-burning appliances in your
home.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from
National Fuel Gas Code. NFPA
54/ANSI 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 5
through 6 will help you classify
your space and provide adequate
ventilation.
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
× ×
Length Width Height=
Example: Space size20ft. (length)
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)
Example: 2560 cu. ft. (volume of space)
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. W alls and ceilings exposed to the
outside atmosphere have a
tinuous water vapor retarder with a
rating of one perm (6
pa-sec-m 2 ) or less with openings
gasketed or sealed and
b. W eather 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 Determin-
ing Fresh-Air Flow for Heater
Location, page 5.
× ×
width
cu.ft. (volume of space)
× ×
16ft.( width) 8ft. (ceiling height)=2560cu. ft. (volume of space)
50 cu. ft.=(Maximum Btu/Hr the space can support)
÷
50 cu.ft.=51.2 or 51.200(maximum Btu/Hr the space can support)
÷
Confined and
Unconfined Space
The National Fuel Gas Code
ANSI 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
the aggregate input rating of all
appliances installed in that space
and an unconfined space as a
space whose volume is not less
con-
than 50 cubic feet per 1,000 Btu
per hour (4.8 m
×
10 -11 kg per
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 consid-
ered a part of the unconfined
space.
This heater shall not be installed in
construction unless provisions are
provided for adequate combustion
and ventilation air.
*
ing only if there are doorless passage-
ways or ventilation grills between them.
height).
5
3 per kw) of the
a confined space or unusually tight
Adjoining rooms are communicat-
3 per kw) of