Originally Posted by
Drew Wiley
Here you go again, Pere. You're guessing. I actually have decades of experience distributing fans, including the entire line of Panasonic, and have specified all kinds of applications, including not only private darkrooms but commercial photo labs and all kinds of scientific research facilities. Within walking or bicycle distance of my former office and warehouse were some of the biggest pharmaceutical, biotech, and university research labs in the entire world. An everyday issue for me. My own big squirrel cage outside my sink room has been running quietly and flawlessly for forty years now. A good investment. You need to understand things like hydrostatic pressure related to humidity, air friction in the ducting etc. The only problem with my exterior fan is that every few years wild bees try to make a hive in it - so I have to leave it running a few days to discourage them ! In my house I use a Panasonic in-line duct fan instead, for the bathroom shower steam, which pulls the air all except for the last few feet to a roof exhaust cap. Really nice and super-quiet. I also have an actual clean room in my lab, separate from the sink & processing room. It has a big electrostatic air cleaner. If biohazard is potentially involved, what on earth are you developing in that darkroom anyway, film from the Andromeda Strain satellite ???
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