Burr King BK75 - Manual (Page 15)

Donaldson Company, Inc.
14
Ductwork
Note: If unit is operated with more than the
maximum permissible inlet size, the fan
motor can overload or dust can settle in the
duct due to low air velocity.
1. Inlet collars can be located on the side, top, or
back of the cabinet by removing the desired
inlet cover plate and installing the inlet collar
using the same screws.
2. Use the shortest possible inlet duct. Avoid the
use of tees or flexible, wire-molded duct except
where machine motion or vibration needs to be
isolated. Flexible duct has a high static pressure
and reduces airflow.
3. Size duct for the recommended air velocity of
the conveyed material or material may collect
inside the duct.
4. Connect joints with sheet metal screws, rivets,
or sealer. Finish each joint with sealer or duct
tape.
Note: Sheet metal screws may cause fibrous or
stringing particulate to accumulate inside
duct. Use rivets or sealant in these
conditions.
Suction Tube Assembly
3- and 4-Inch
1. Apply a thin layer of grease to the inside
surface of the inlet collar.
2. Slide the suction tube base into the inside of the
inlet collar. Swivel the suction tube to lubricate
all surfaces.
3- and 4-Inch Suction Tube Assembly
3 or 4-in
suction tube
assembly
inlet collar assembly
3 or 4-in