Filter Queen replacement HEPA filter, fits Filter Queen Defender 4000. This filter measures approximately 8 H x 7 1/2 ID x 11 1/4 OD. This is a HEPA filter and is 99.97% effective at removing particles as small as .3 microns from the air that passes through the filter. For optimum performance, replace filter every 12 months. Filter Queen Defender 4000. Filter Queen replacement HEPA filter! Measure
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