I will only add that manufacturers of bath fans and kitchen fans often greatly over state the capacity of their equipment to move air.
A 500 cfm bath fan often only moves 90 cfm in the real world and kitchen fans listed as 900 cfm come in closer to 300 when tested by someone other than the maker.
These things are only moving cooking fumes and bathroom steam so no one is going to get poisoned if they stretch the truth a lot.
Industrial fans have a much better chance of actually expressing the true capacity of the purchased equipment.
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The Zombie Apocalypse is Upon Us.
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