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Air filter assembly

  • US 5,217,513 A
  • Filed: 05/11/1992
  • Issued: 06/08/1993
  • Est. Priority Date: 05/11/1992
  • Status: Expired due to Fees
First Claim
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1. An air filter assembly for an air circulating system comprising a peripheral frame adapted to be supported in communication with an intake opening in a return air duct, a polyfoam filter mounted in said frame, a paper filter engaged with an inlet surface of the polyfoam filter to remove particulate material from air passing through the polyfoam filter, said frame having inwardly facing generally channel-shaped guides at opposite edges thereof receiving edges of the paper filter, said paper filter being provided on a supply roll at one edge of the polyfoam filter, means mounting the supply roll from the frame, the paper filter including a free end at the edge of the frame opposite to the supply roll to enable the free end of the paper filter to be moved to move a used segment of the paper filter outwardly of the polyfoam filter and aligning an unused segment of the paper filter with the polyfoam filter.

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