Donaldson P191844 Endura-Tek flame retardant filter replacement is 12.74 x 26 inches with an open top and closed bottom with bolt hole. Performance and fit are guaranteed. Replaces Donaldson P191844, P191844016002, P191844-016-002 Used primarily in Large TD Collectors, Aerbooth, Binvent, ECB, Probooth, MTD 12.74" OD x 8.38" ID x 26" Long Open Top with Gasket, Closed Bottom with 9/16" Bolt Hole Approximately 220 sq.ft 80/20 filter media rated MERV 12 Galvanized Steel end caps 100% Guaranteed Fit and Performance Filtra-Systems Ultra-Life dust collector cartridge filters are designed to perform in all dust collection applications. Various filter media options are available including MERV 15 nanofiber ideal for welding fume and smoke, robust MERV 11 spunbond polyester for abrasive applications and traditional MERV 12 cellulose synthetic blend for general applications. *NOTE: Brand names are used for identification purposes only, and are the intellectual property of the OEM. Filters are OEM Replacements manufactured by Filtra-Systems and are not OEM Brand products unless specifically stated as such. Filtra Supply is not related to the OEM.