I am in the process of completing a new darkroom in the basement and wanted to s olicit some additional opinions on the subject of insuring adequate ventilation. The complete darkroom will be 2,400 ft3 and the front of it will be wet and is also where the 8ft sink will be located. A manual I got for darkroom design says that I should cycle the air in it every 6-8 minutes. That calculation would req uire a 400 CFM fan. Is that adequate? I need to go 9 feet along the ceiling from where the sink will be located to where the wall is that I can get acess to the outside. Above me I have floor joyce support members that are 14" wide and if i t is possible I would like to put the vent motor(s) and the ducting in this ceil ing access to maintain as much ceiling height as possible. Secondly, for a exhau st fan should I look at manufacturers that have products specifically designed f or the photo industry or will any fan that fits inside the joyce space work? Sho uld I place the vent motor at the wall and use custom ducting to place the negat ive pressure inlets over the sink area? How about louvers that maintain a light tight work area? Are they required and where is the best place to put them? Many Thanks.
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