A safe darkroom is one where the air is changed every few minutes. This fan exhausts up t400 CFM and can completely change the air in less than 4 minutes. If the stale air is exhausted inta dark crawl space, removal of a louver doubles the exhaust rate t800 CFM. Features a 6" diameter pipe starter, 12" x 12" x 4".
Reviewed by 2 customers
Very disappointed in this fan. Seems like a cheap imitation of a Doran. WAY too noisy. Returning for a refund.
I am setting up a darkroom, and ventilation is critical. This was a perfect fit with being light tight and having the needed air movement.