something else to consider is if you are using a cutting table and the air is being pulled through it then you lay a full size sheet of material on top of it. You have the proper sized blower and ductwork, but you just choked the airflow by covering the cutting table. It is like having a dirty plugged filter on your central heat & air unit. How can it breath?
Having the potential to move 1500 cfm but restricting the inlet (cutting table covered) will not let 1500 cfm flow.
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