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Manual D

Hey Ed, What is Friction Rate?

In this edition of “Hey Ed”, Ed discusses friction rate.

The Right Filter – Don’t Guess at Pressure Drop

In Manual D®, the duct design process has you fill out a friction rate worksheet. In step two, you are required to record component losses. Filters count as one of those losses. So, are you looking up the pressure drop of the filters you are using? If not, it could be the cause of many systems having insufficient airflow.

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