add 1 in. of extra static pressure to the total for each branch, to account for dirty filter bags and internal friction in the collector.

STEP 5: Select a dust collector rated to meet or exceed the CFM requirements of the most demanding machine on the system (usually the planer) at the highest static pressure loss you calculated for any one branch (assuming you'll run one machine at a time).

Example: Step 4 determines that the longest branch in your system has a static pressure loss of 5.27 in. The planer in your shop requires a minimum air flow of 500 CFM (from Table 1). You would select a dust collector rated to move at least 500 CFM at a static pressure of 5.27 in. or above. Oversizing the collector doesn't hurt.—D.S.

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