NEW HEPA FILTER 48" X 48" V-BOTTOM 24" DIA. FLANGE | eBay
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47X23x5-HEPA-FILTER-REPLACEMENT-ULPA
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China Supplier 0.3 Micron 99.99% H13 14 HEPA Air Filter 24 X 48 Portable with Aluminum or Galvanized Frame /HEPA Filter for FFU - China HEPA Filter, Filter | Made-in-China.com
Amazon.com: TheSafetyHouse Wooden HEPA Filter (24" x 24" x 11.5") : Home & Kitchen