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The Trion 243342-002 22" x 13.5" Prefilter - 3/4" Foam is a replacement pre-filter that fits select Trion electronic air cleaner models. This Trion air filter measures 22 inches x 13.5 inches (3/4 inch foam) and helps capture larger airborne particles. The Trion prefilter helps your air cleaner function properly to help reduce airborne contaminants.