General Information and Sizing

KEI  has changed blower styles and we are now using airfoil fan blades which are recognized as the industry’s most efficient and quietest design. This  means more CFM and a smoother running dust collector.

 2500 CFM     Our 5HP units will now move 2500 CFM at a full 9” of static

                        pressure.Models included are #1325,  #3055, and #5025.

 3800 CFM    Our 7.5 HP units will now move 3800 CFm at 10” of static pressure.

                      Models included are #3900, #4000, #5035, and #5040

 5000 CFM    Our 10 HP units will move 5000 CFM at 9” of static pressure

                       Models included are #3910, #4010, and #5050.

 6500 CFM     Our 15 HP units will now move 6500 CFM at 9” of static pressure.

                       Modela included are #3915,  #4015,  and 5060.

 10,000 CFM   What’s really new is that we now go to 10,000 CFM at 9” of static pressure using a 20 HP motor running at 1750 RPM. Now we have a larger unit, less noise and a big savings on electrical power required. Our new model #5080 cartridge dust collector has 8 filters with an air-to-cloth ratio of 4.6 to 1.

 By using larger , longer dust bags in the new model 3920, we can have a 10 to 1 ratio. Much improved over our old #3910 model which had an air-to-cloth ratio of 20 to 1.

AIR FLOW

TERMS:           VELOCITY--  FPM (feet per minute);   the speed of air

                      CFM--  cubic feet per minute;   volume of airflow

   Area--   square foot of space the air is moving through

  SP--  static pressure; reduces airflow

 The diameter of the duct work is the real key item. You can only move so much air through a given area before static pressure works against you.

Velocity = CFM ÷Area Or CFM = Velocity x Area

Recommended Velocities: For smoke:  2000-2500 FPM is required

On the average,  4000  FPM moves most materials

Such as;  sawdust,  plastic, fine metal dust 5000 FPM is OK 6000 FPM is too much static pressure reduces the effect.

Remember: Area of a circle---  A= π r2,  Circumference of a circle--- C= π d, 144 Sq. inches in 1 Sq. Ft.

To size airflow required—find the number of drops (or machines to have the dust collector hooked up to)  and the size required at each drop. Add them up and you can find the volume of air needed (CFM).

If you can use shut-of gates, you can reduce the amount of air required. To balance a dust system , you need to start at the furthest machine away from the dust collector, and each time you pick up another machine you increase the diameter of the main line.  So a 4” line that picks up another 4” line will at that point, increase to a 6” diameter and so on back to the dust collector.

AIR FLOW FOR KEI UNITS                                     3 PHASE UNITS