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I order my HIVAC filters from Amazon, cause they are a weird size and I often have to go to three or four different places to find any. I put a reminder on my calendar to replace them every 3 months. They are not gross in three months, but plenty of dirt colored stuff in the air flow.
I buy cheaper brand of filters, and change them more often than the expensive ones. They are not the super cheap, just mid range filters. I can't see spending big bucks for the expensive ones.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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