Air For Combustion And Ventilation - Procom FBN400RHA Series Owner's Operation And Installation Manual

WARNING
: This heater
shall not be installed in a confined
space or unusually tight construc-
tion unless provisions are provided
for adequate combustion and ven-
tilation air. Read the following in-
structions to insure proper fresh
air for this andother 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
th e t hree f ollo wing
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 size 20ft. (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)

AIR FOR COMBUSTION AND VENTILATION

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 3 per kw) of the aggregate input
rating of all appliances installed in that
space and an unconfining space as a
space whose volume is not less
than 50 cubic feet per 1,000 Btu per
hour (4.8 m
input rating of all appliances installed
in that space. Rooms
ing directly with the space in which
the appliances are installed*, through
openings not furnished with doors,
are co nsid ered a
unconfined space.
This heater shall not be installed in
a confined space or unusually tight
construction unless provisions are
ven tilation
provided
and ventilation air.
* Adjoining rooms are communicat-
ing only if there are doorless pas-
sageways or
tween them.
cu.ft. (volume of space)
×
16ft.(width)
÷
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)
5
3 per kw) of the aggregate
communicat-
p art of
for adequate combustion
ventilation grills
× ×
width height).
×
8ft. (ceiling height)=2560cu. ft. (volume of space)
5
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
defined as construction where:
a) walls and ceilings exposed to the
outside atmosphere
continuous water vapor retarder
with a rating of one perm (6
p er p a- s ec -m
openings gasketed or sealed and
b) weather stripping has been added
on windows that can be opened
th e
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
p a n e l s , a t p e n e t r a t i o n s f o r
plumbing, electrical, and gas
lines, and at other openings.
If your home meets all of the three
criteria above, you must provide
be-
additional fresh air. See Ventilation Air
From Outdoors (page 6).
If your home does not meet all of the
t hree c riteria ab ove, p ro ceed t o
Determining Fresh-Air Flow For
Heater Location (below).
construction is
have a
×
10 kg
-11
2 ) o r l es s w it h