FILTER ELEMENT; FILTRATION GRADE: 1 MICRON; FLUIDS: AIR; MATERIAL: FILTER PAPER WITH GALVANIZED STEEL FRAME; HIGH EFFICIENCY FILTER, SPECIALLY DESIGNED FOR ROTARY MACHINERY, PULSATING FLOWS, COMPRESSORS AND GAS TURBINES AMERICAN AIR FILTER BRAND MODEL DURACEL XL-90 24”X 24”X 12” OF 90 – 95% EFFICIENCY PER A.S.H.R.A.E. 52.1.1992, WITH GALVANIZED STEEL FRAME, PLEATED FILTER PAPER WITH CORRUGATED ALUMINUM SEPARATORS, METAL MESH PROTECTION ON AIR INLET AND OUTLET FACES, GASKET SEAL ON BOTH FACES AND WITH ADDITIONAL LATERAL FIXING SYSTEM WITH SLOTS FOR COUPLING OF FIXING CLAMPS AND UPPER EXTRACTION SYSTEM BY MEANS OF TWO FOLDING RINGS.; MANUFACTURER 1: AMERICAN AIR FILTER; PART NUMBER 1: 515-556-006; MODEL 1: DURACEL XL-90