I have read all the negative reviews but my excitement at purchasing 1 filter has consistently exceeded my good judgement. Long story short, after using this filter in my 2 year old HVAC system for almost 4 months, it was still as clean as the day I installed it. I'm not joking, if I look through with a lamp behind it, NO dust will be visible! The world's paper filters are changed every month and they were DIRTY with 4 dogs and a cat running around. And of course, by the time I found out it was a manure filter, Revain's 30-day policy had long since expired. Not a happy camper! Who knows how much life was taken from my new HVAC system with dust stuck in the fan, motor and core and now when I think of all the dust stuck in my vent system. It just burns me, like my mother says!
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