2'x4' Fan Filter Unit; WhisperFlow, 99.99% @ .3 Microns, RSR, 120V, Powder-Coated Steel6601-24A-HR $3,788.00 SKU: 6601-24A-HR Back $3,788.00 Quantity -+ Add to Cart Details 2'x4' Fan Filter Unit; WhisperFlow, 99.99% @ .3 Microns, RSR, 120V, Powder-Coated Steel DetailsBackDetails2'x4' Fan Filter Unit; WhisperFlow, 99.99% @ .3 Microns, RSR, 120V, Powder-Coated SteelSee MoreSee Less