Some time back I posted pics of my "last darkroom" and there were several questions about my venting. When I built and installed my darkroom sink I built and installed a box (aka "shelf") unit above the sink and then used two bathroom exhaust fans to move enough air for my space. The box was necessary to hide the vent hoses and all the electrical wiring that is feeding my exhaust fans, and inspection light. And since the exhaust fans are installed up underneath the soffit and directly over the processing trays the fumes get sucked up and away and through a vent hose that goes into the attic which then gets drawn out through the attic vents to the outside. It seems to work quite well and I believe the air exchange rate is at 110 CFM per fan for a combined 220 CFM (just over 5 minutes for a complete exchange of air or about 11 exchanges per hour if my math is correct)which seems to handle my 11x12 darkroom with a 9 ft ceiling well enough.
I bought the fans from Home Depot and so far I am quite happy with their efficiency and low noise level. Not super quiet but quieter than most exhaust fans I have experienced. And with music playing in the background the fan noise is not an issue.
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