F300 ELECTRONIC AIR CLEANER
768-0240EF-5
Fig. 3. Mounting positions with variety of furnace installations.
Determine Duct Design Requirements
The air cleaner is adaptable to all new or existing forced air
heating, cooling and ventilating systems used in residential
applications. Transitions, turning vanes, or offsets may be
needed in some applications for effective operation.

Transitions

Transitions are needed when the duct is a different size than
the air cleaner cabinet. Gradual transitions reduce air
turbulence and increase efficiency. Limit expansion to no more
than 20 degrees or about 4 in. per running foot (100 mm per
300 linear mm) on each side of a transition fitting.
See Fig. 4.
Fig. 4. Change duct size gradually to minimize turbulence.

Turning Vanes

If the air cleaner is installed close to an elbow or angle fitting,
install turning vanes inside the angle to distribute airflow more
evenly across the face of the cell. See Fig. 5.
M19777
A
B
CD
E
FG
20 DEGREE EXPANSION PER SIDE PER
FITTING (4 in. PER LINEAR FOOT
[100 mm PER 300 LINEAR mm]).
RETURN
AIR DUCT
TRANSITION FITTING
ELECTRONIC AIR CLEANER CABINET
M5626A
CHANGE DUCT SIZE GRADUALLY TO MINIMIZE TURBULENCE.