Fresh-Aire UV® TUV-PRT-ER-17.5F 17.5" x 28" Furnace Purity Filter Housing Includes: TUV-RFM-4-1625 4" Reactive Filter Media w/ Goldshield, TUV-PRT-PCO-1-1625 1" UV filter w/ TUVL-200F-OS lamp and PCO media, TUVP-ER low voltage remote ballast, mounting hardware.