20x20x1 (19.5x19.5) SUPERFLOW BLUE Permanent Washable High Performance Air Filter
Superflow permanent air filters are the most durable, high performing washable type air filters available. The unique 100% Synthetic filtering media outperforms polypropylene mesh electrostatic filters in dust efficiency, dust holding, and service life. Unlike electrostatic washable filters, Superflow Blue filters will not lose efficiency during operation. With a heavy-duty frame construction, and a fully replaceable and recycleable filter media, it is easy to see why homeowners prefer the Superflow Blue washable filter as much as 5-to-1 over washable electrostatic filters.