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PPI - Professional Plumbing Service
1435 S. Barrington Road, Barrington, IL 60010

Hepa Filters are an excellent way to remove 99.97% of all particles .3 microns or larger (as a reference a micron is 1/1,000,000 of a meter a human hair is normally 75-100 microns in diameter. Under ideal conditions the human eye can only see particles 10 microns or larger). These filter systems can normally be easily installed on you existing heating/cooling system.