GeneralAire ReservePro 4551 MERV 11 OEM 20X25 filters exactly fits part # 4501. GeneralAire part #4551. Nominal Size: 20" x 25" X 5" Actual Size: 19 5/8" x 24 3/16" x 4 15/16". Efficiency Rating: MERV 11 High-efficiency MERV...

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GeneralAire ReservePro 4551 MERV 11 OEM 20X25 filters exactly fits part # 4501. GeneralAire part #4551. Nominal Size: 20" x 25" X 5" Actual Size: 19 5/8" x 24 3/16" x 4 15/16". Efficiency Rating: MERV 11 High-efficiency MERV 11 Media Filter # 4551. Fits GeneralAire GF-2025, GF-GAFB2832, GF-GAFB2843, Mega-Mac MAC2000, MAC-L; Lennox BMAC-20C, MAC-10, MF1-20; Source1 S1-MAC10202505; Totaline P101-MF20; Trion Air Bear 2000; York S1-MAC10202505. High-efficiency MERV 11 Media Filter with more surface area for a longer filter life.

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