The area of an 8-in. duct is .35 sq. ft. You measure the velocity at a points in the duct and find the average velocity in the exhaust duct is 400 FPM. Multiply 400 Feet per Minute times the area of the duct, which is .35 square feet, to find 140 CFM exhaust fan airflow.
24/7. For credit card account questions, call the phone number on the back of your card or on your billing statement. You may also call 1-800-432-3117. See more Chase phone numbers. Find a Chase ATM/branch. Send a secure email.
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