DeFendAir™ Replacement Hepa 500 Filters, aluminum frame, 99.97% efficiency (OEM# F321), 4 filters per case:



  • Fits DeFendAir™  500, (OEM# F321), Synthetic Hepa Filter: GK-F321
  • aluminum frame, 99.97% efficiency
  • 4 Filters per case

Green Klean® Replacement Hepa filter designed for exact fit and performance as the OEM, at a considerable savings.

Better filtration means cleaner air, less dusting, and longer secondary filter life. Each bag is printed to easily identify the vacuum it fits. Clean with Confidence, Replace with Green Klean®.


Green Klean® Superior Quality Replacement Vacuum Filters are specifically designed for the Janitorial Professional and are backed by the Green Diamond Warranty. Made from the highest quality materials to achieve superior filtration efficiencies.

  • Fits DeFendAir™  500, (OEM# F321), Synthetic Hepa Filter: GK-F321
  • Designed for commercial use; equal to/exceeds OEM quality
  • Exclusive Green Diamond Warranty
  • 4 Filters per case


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Green Klean® Green Diamond Warranty