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Transitions
For most efcient air cleaning, spread airow evenly
across the face of the media. If the duct is a different
size than the media air lter cabinet, gradual transitions
are required. Follow these guidelines when fabricating:
• Use gradual transitions to reduce air turbulence and
increase efciency.
• Use no more than 20 degrees (about 4 in. per
running ft. (100 mm per 300 linear mm)) of
expansion on each side of a transition tting.
Turning Vanes
If the media air cleaner is installed next to an elbow
or angle tting, add turning vanes inside the angle to
distribute airow more evenly across the face of the
media. See middle gure.
Sheetmetal
The media air cleaner is adaptable to all new or
existing forced air heating and cooling systems used
in residential applications. Transitions or turning vanes
may be required in some applications for effective
media air cleaner operation.
Offsets
If the duct connection to the furnace in a side
installation allows less than 7 in. (178 mm) for mounting
media air cleaner cabinet, attach an offset to the elbow.
See bottom gure at right.
TURNING
VANES
M5651
M948B
LESS
THAN
7 in.
(178 mm)
OFFSET
AT LEAST
7 in.
(178 mm)
1
1 REQUIRED TURNING VANES HELP DISTRIBUTE AIRFLOW EVENLY.
20 DEGREE EXPANSION PER SIDE PER
FITTING (4 IN. PER RUNNING FOOT
[100 MM PER 300 LINEAR MM])
RETURN AIR
DUCT
TRANSITION FITTING
ELECTRONIC AIR CLEANER CABINET
M947B
DUCT SIZE CHANGED GRADUALLY TO PREVENT TURBULENCE.
F100 Media Air Cleaner 68-0239EF—05
4