
How Much Airflow Does a Dirty Exhaust Fan Lose?
A grease-clogged kitchen exhaust fan can lose 30 to 50 percent of its rated airflow, and the drop starts long before the kitchen feels smoky or hot.
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A grease-clogged kitchen exhaust fan can lose 30 to 50 percent of its rated airflow, and the drop starts long before the kitchen feels smoky or hot.

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