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Geezer installing a darkroom ...
On 9/4/2009 7:27 AM Thor Lancelot Simon spake thus:
I would not try to run a darkroom with positive-pressure ventilation. It sounds good in theory, but a wet darkroom makes a lot of dirty air which you really want out before it can irritate your mucus membranes and your lungs. If anything, balanced airflow, with fans for both intake and exhaust air, blowing across the sink, would be the best way to go. I can see that as a potential problem, but wouldn't it depend on where the air inlets and outlets were? If the air source were on one side of you and an outlet placed on the other side of the wet area, then airflow would carry the moisture and fumes away from you, no? But in any case I can see that careful design is called for here. -- Found--the gene that causes belief in genetic determinism |
#12
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Geezer installing a darkroom ...
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#13
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Geezer installing a darkroom ...
"Thor Lancelot Simon" wrote
I would not try to run a darkroom with positive-pressure ventilation. It sounds good in theory, but a wet darkroom makes a lot of dirty air which you really want out I would think the relative pressure doesn't really matter with regards the freshness of the air in the darkroom - all the air that goes in has to go out in any system. The problem with positive pressure is the possibility of fumigating the house with fumes from the darkroom - but I have never noticed darkroom odors in other parts of the house though the darkroom is positive pressure, just about all the air goes out the exhaust vent. If the fumes from the trays are a nuisance then I would arrange a hood over the sink, possibly with a low power exhaust fan, and make sure a majority of the air exits the room via the fume hood. But the room should be at positive pressure with respect to the surroundings to keep it clean. You push clean air in and let dirty air out. With negative pressure you suck dirty air in through the cracks and push even dirtier air out - though you do have more control over where the dirty air goes. I've done a lot of work in and with electronics clean room labs and manufacturing and it is all positive pressure. Biohazard labs and chemistry labs on the other hand are negative pressure. Me, I hate dust and love the smell of fixer. If your proclivities are the other way around, well, all I can say is your darkroom sucks. Er, should suck. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/da-main.htm n o lindan at ix dot netcom dot com |
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