No need to know the vocabulary first
A few words, explained
- CFM
- Cubic feet per minute: a measure of how much air flows in one minute.
Start with the tool, then trace the path
List the machines that will run one at a time or together, the pickup size at each tool, the duct route, flexible hose sections, and every fitting. The tool's needs only matter if the system can move the air there.
Read a CFM chart as a planning reference
A chart helps compare typical collection needs by machine and pickup size, but it does not replace the pressure-loss calculation or the equipment manufacturer's guidance for your exact system.
Protect airflow at the machine
Shorter runs, smoother transitions, properly sized ducts, clean filters, and open blast gates on the active run all help preserve airflow. Fix the largest restriction before adding complexity.
Shop 101
Apply this reference to your project
Use your own project measurements and record how the result affects the material, setup or estimate.
- Name the material, dimension, or cost input that affects the decision.
- Use the reference and related calculator to check the measurement or estimate.
- Test or compare the result before committing final material, time, or client scope.
Try it with your own numbers
Common questions
What CFM does a woodworking dust collector need?
The needed airflow depends on the tool, pickup design, duct size, route, fittings, and whether other ports are open. Use a calculator and manufacturer guidance to plan the actual system.
Why does a dust collector lose suction at the tool?
Long or undersized ducting, flexible hose, sharp fittings, leaks, clogged filters, and multiple open branches can all reduce the airflow that reaches the machine.
Can a CFM chart size the whole system?
Use it as a starting reference. A complete system plan also considers static pressure, duct layout, collector performance, and the specific machine pickup.