Wednesday, August 14, 2013

Aprilaire 501 Replacement Filter

Aprilaire 501 Replacement Filter

This is the high efficiency filtering media, which is the heart of your air cleaner. It is recommended that the filter be replaced annually.


  • Fits Research Products Model No. 5000 (Part #501)
  • New aftermarket Aprilaire 501 filter!!
  • Original accordion type design.
  • Protects heating and cooling equipment.

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