5
PLANNING THE INSTALLATION
- WARNING -
The F72 Industrial Electronic Air Cleaner is not
explosion-proof. It must not be installed where
there is danger of vapor, gas or dust explosion.
INTRODUCTION
Clean air is the subject of numerous laws and
regulations. Typical requirements in the United
States are those put out by the Occupational
Safety and Health Administration (OSHA). Private
groups, such as the American Society of Heating,
Refrigeration and Air Conditioning Engineers
(ASHRAE) have also published numerous
recommendations.
Normally, clean air is defined in regulations and
recommendations as air having a limited amount
of contaminant in it, commonly expressed as parts
per million, or milligrams per cubic meter.
Approved counteractions are intended to lower or
eliminate the amount of contaminants in the air.
One of the more common methods of achieving
this goal is through the use of electronic air
cleaners.
At no time should an electronic air cleaner be
placed where there is a potential for explosion due
to the presence of explosive dusts, gases or
vapors. Contact the nearest Air Quality
Engineering, Inc., representative for assistance in
determining the correct application of an electronic
air cleaner.
AIR CLEANER SIZING
The F72 Induct Air Cleaner is usually sized
according to the capacity of the air handling
system and desired efficiency. See Fig. 4.
LOCATION AND POSITION
Because air-handling systems vary greatly in
arrangement and style, factors such as location,
air distribution, transitions, etc., require careful
consideration.
The F72 can be mounted in a vertical or horizontal
duct. If the air cleaner is to be mounted in a
vertical duct, position the F72 so that the hinged
access door opens down.
TRANSITIONS
When adapting the duct to fit the air cleaner, use
gradual transitions in duct size to prevent
turbulence and to increase efficiency.
Duct transitions should not exceed 20 degrees
(about 4 inches per lineal foot [101.6 mm per lineal
304.8 m]) on each side of a fitting.
FIGURE 2
–
TYPICAL INSTALLATION
OUTDOOR AIR
When outdoor air is added to the return air duct,
sufficient heat must be added to maintain a
uniform air temperature between 50°F and 125°F
[10°C and 52°C]. Two methods are
recommended:
1. Baffles. Mixing baffles should be used to mix
the outdoor air and the return air before it
enters the air cleaner.
2. Preheat Coil. If a large amount of outdoor air
is used, it must be heated. An appropriate
control system should be used to control the
heating element (electric strip heater, steam
coil, etc.)
Outdoor air intakes should be protected to prevent
the introduction of unnecessary contaminants.
Depending on the installation, it may be necessary
F72 ELECTRONIC
AIR CLEANERS
STACKED
AIR
DUCT
AIR
DUCT
