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#11
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Ventilate or Scrub
"Dan Quinn" wrote in message om... With all the talk of darkroom ventilation, air scrubbers came to mind. I've been reminded of those who turn on the shower to clear the air. At www.safelab.com click on, technical resources. Dan Just a thought, In the type of system you envision with the scrubber, you would also need to control humidity. The size of this system just got larger by a whole bunch... __________________________________________________ _____________________________ Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com The Worlds Uncensored News Source |
#12
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Horse Feathers!
"PSsquare" wrote in message news Otzi, You asked as series of questions. What is a good filter for incoming air or what can one adapt for this purpose? I am using an American Air Filter pleated "Dirt Demon" that has about 50% collection efficiency at 2.3 microns. There are lot of suppliers out there. The package usually gives the collection efficiency. Collection increases for larger particle sizes, so I am essentially getting most stuff about arond 5 microns. (There are 25.5 microns in one thousandth inch, so that seems adequate. A human hair around 100 to 150 microns, I thinkl.) And what does one use to move the air with? I am using a rotary fan built into a light proof baffle. Bought it from Porters and built a box over the intake to hold a furnace filter. This puts the room at positive pressure. I have a smaller centrifugal fan build into a box and set over the wet sink to exhaust fumes. I pipe the exhaust thru 3 inch flex hose to the outside. The centrifugal fan is bathroom exhaust fan that I boxed into to make it sit on a shelf over the sink. It's capacity is about 40% of the incoming fan, so it does not pull a negative pressure in the darkroom. So overall I filter the input for clean makeup air, capture fumes over the sink and exhaust them. For dust, apart for all the forgoing, has any one tried one of those water pot vacuum cleaners? Apart for the noise would they work? Would need to be going for a fair while to have any effect I would recon. Don't have any experience with what you suggest, but I cannot imagine that a vacuum cleaner would move enough air. They are designed to create high intake suction rather than exhaust quantities of clean air. Anyhow, the noise would be terrible. At least, that it how it seems to me. Good luck PSsquare Thanks, thats given me a bit af a idea any way. |
#13
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Horse Feathers!
One can get a fine particle filter for
a forced-air furnace and/or whole house air-conditioner. I find it keeps dust from being blown into my darkroom. If the darkroom is left fallow for a few months, when I return there is no dust build-up. Obviously the darkroom is hooked to the house's HVAC. -- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. |
#14
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Ventilate or Scrub
"Jim Phelps" wrote
"Dan Quinn"wrote With all the talk of darkroom ventilation, air scrubbers came to mind. I've been reminded of those who turn on the shower to clear the air. At www.safelab.com click on, technical resources. Dan Just a thought, In the type of system you envision with the scrubber, you would also need to control humidity. The size of this system just got larger by a whole bunch... The fume hood unit described at Safelab has all the bells and whistles. I suppose it may exhaust indoor or outdoor. Water flows down and air moves up. Just off-hand I'd think a unit a foot square and three feet tall might do for an eight hundred square foot darkroom. An air velocity of one foot per/second is less than one mile/hour. That air velocity will provide sixty cubic feet/minute of scrubbed and humidified air. A recirculating pump with filter plus a low rpm fan would be required. A sump heater would help bring up the humidity. There would be some maintanence required. Dan |
#15
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Ventilate or Scrub
"Dan Quinn" wrote in message om... "Jim Phelps" wrote Dan, If you vent inside, then humidity will be a problem. For the most part the air traversing the scrubber becomes saturated with water vapor. It would act as a humidifier unless some means are used to dry out the air. Hence a dehumidifier. Most dehumidifiers that are commercially available use the refrigeration process to condense the water out of the air. This will make the expense of installation and operation increase significantly (it'll drive the electrical bill through the roof). Otherwise you must vent to the outside. And if you do vent outside, due to the airflow, this air must be drawn from somewhere and you're back to providing filtered air into the darkroom. The scrubber liquor (I wonder if that's the correct use of that word for this purpose, but who knows) still must be disposed of so you are not reducing the chemical disposal and environmental issue Now, I'm all for ecological darkroom use. However, _I_ do not believe the particulate or emissive vapors are of significant quantity from the home darkroom enthusiast to warrant the expense of a scrubber. A good cross ventilation system with one or more blowers would provide the best - and cheapest - method of maintaining a healthy and fume free darkroom. For those looking for good, cheap and efficient filters for your darkroom needs, don't overlook the pleated paper filters available in the Auto Parts store. Some diesel engines use good size ones, they're practically a HEPA filter and cost about $10.00. I used one in a home made negative drying cabinet... __________________________________________________ _____________________________ Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com The Worlds Uncensored News Source |
#16
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Ventilate or Scrub
"Jim Phelps" wrote
Dan, If you vent inside, then humidity will be a problem. For the most part the air traversing the scrubber becomes saturated with water vapor. It would act as a humidifier unless some means are used to dry out the air. Well I'd have to play with it some. Saturation would likely never occure due to my leaky, intermittently used, moisture absorbing darkroom. A low, medium and high setting using a split phase fan motor may help. Besides, I'm after a higher humidity. The scrubber liquor (I wonder if that's the correct use of that word for this purpose, but who knows) still must be disposed of so you are not reducing the chemical disposal and environmental issue. Liquor? water would be more like it. That goes down the drain. The pump filter catches the particulate matter. Now, I'm all for ecological darkroom use. However, I do not believe the particulate or emissive vapors are of significant quantity from the home darkroom enthusiast to warrant the expense of a scrubber. Think of it as a humidifier which will de-oder, de-fume and de-particulate. For those looking for good, cheap and efficient filters for your darkroom needs, don't overlook the pleated paper filters available in the Auto Parts store. Some diesel engines use good size ones, they're practically a HEPA filter and cost about $10.00. I used one in a home made negative drying cabinet... Pre-filtering and activated charcoal might be a good idea. That would be the delux version. |
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