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Merv rating of 8 or better will be fine , and make sure is pinch pleate style they hold a lot more , when using these style filters one must change them more periodically than manufacturers say , they say every 3 months , I say more like once a month , every 3 weeks if have pets and lots of dust .
Hope this helps GL PS .3 removes stuff as small as cig smoke . That will do plenty well for a grow room , but 1 mic is fine to .
-------------------- Any information I give is not intended to aide you in the production of potentialy illegal substances !None of my exp comes from growing illegal varities , so take it as you will .
So with that said here is our mission statement .
Then the priest fell into a trance or swoon,& said unto the Queen of heaven ; Write unto us the ordeals; write unto us the rituals; write unto us the law !
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