Reply by Grandpa

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Posted on How large or how many filters - air filtration

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3259 posts in 2701 days

#1 posted 07-13-2011 03:05 AM

If you are blowing the air outdoors, why have a filter? you are cleaning the air in your shop and getting rid of it. Of course I live in SW Oklahoma and the wind blows constantly so a little dust is not even noticeable. I think a person should buy a good filter from Grizzly or Penn State or anyone that markets a good filter (.5 micron or something like that) and make his blower work on that. Then buy regular furnace filters and put it in the line first to keep the better filter as clean as possible. Then discharge the air back into the shop. You could use 2 of the good filters inside if you wanted. In my ACE hardware store the filters all cost the same price whether they are 20×20 or 30×30. The larger filter should still work just as well. You are going to restrict it right away anyway.

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