How Much CFM Do I Need For Dust Collector?

(Last Updated On: June 13, 2020)

Many companies make a big deal out of CFM or motor horsepower ratings when they are selling dust collectors. The specifications may appear to be useless unless you have a complete picture of your requirements. You need to measure the exact value rather than going for the numbers written there. Until you know how to measure the specifications, you will never know if it is appropriate for you. In this buying guide, we will help you understand how much CFM you need for a dust collector. You can follow the simple steps and make sure how much CFM will be suitable for your projects and requirements.

  • Determine how much CFM is required by each machine or tool that is placed in the shop
  • Which tools or machines are used commonly and most frequently?
  • You need to calculate and measure the exact CFM through and check out the duct sizes for every tool
  • Understand what the proper cyclone size will be
  • Determine the size and shape of motor size and blower
  • The electrical power requirements should also be kept in mind


Dual Velocity

For metalworking dust, you will need 4500 FPM, while for the woodworking dust, you will require 4000 FPM. If the sand is lighter, a 3500 FPM will be suitable.

Determine The Size Of Every Branch

There are many ways in which you can determine the extent of every chapter in the dust collector.

  • If the dust collector has a diameter outlet, you can convert it into inches after getting a proper measurement
  • If the outlet of the dust collector is rectangular, you can round it to an equivalent round diameter
  • Figure out the CFM for every branch once you have noted down the velocity


Determine The Diameter Of Each Duct

Let’s look at how you can determine the width of the pipes inside the dust collector

  • You have to know how many machines are going to be your primary machines. Sometimes you may have to operate one machine while on the other day; you may have to run more than two devices.
  • Add up the total of every duct and branch to accommodate a total of CFM and this is the only way to find out how much CFM will be suitable for your work.
  • 700 CFM will be the right choice for many projects as it can collect a considerable amount of dust and debris


Figure System Resistance

You will get the total static pressure by adding up all the necessary measurements. They consist of a huge list of entry loss, filter loss, and static pressure of primary and secondary branches.

  • If the dust collector has more than one filter, you will have to get a high CFM for cleaning.
  • The filters and entry loss system in a dust collector needs to be measured appropriately
  • The system requirement for 1,250 CFM will help you figure system resistance and quality of the dust collector too



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