Reply by Glen

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Posted on Air filtration

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9 posts in 3030 days

#1 posted 04-11-2013 08:48 PM

I use 2 (doubled up) 20×20 filters on my home made unit – a furnace fan inside of a box that I built. I find that if I cover the outside filter with bounty paper towels the paper towels pick up the finest dust. When they start to discolor, its time for new towels on the filter. When the outside filter will start to discolor I will put the new filter on the inside of the stack and use the old inside filter on the outside – the paper towel side. I’ve been using the original filters for over 2 years. I was thinking about putting a timer on the unit but find that if I turn it on when I first start working there is little or no dust in the air by the time I finish cleaning up what I was doing.

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