notice inviting tender for the supply of filter elements on proprietary basis supply of filter elements on proprietary basis , second stage suction filter element of process air compressorformp-nitric acid plant. mist eliminator : grade f6 2nd stage compact pocket filter freudenberg make , model t60. , third stage suction filter element of process air compressorformp-nitric acid plant. final filters: grade f7 3rd ( final ) stage compact pocket filter freudenberg make. , first stage suction filter element of process air compressorforhp nitric acid plant. pre filter : grade g4 1st stage compact pocket filter freudenberg make , model f40. , second stage suction filter element of process air compressorforhp nitric acid plant. mist eliminator : grade f6 2nd stage compact pocket filter freudenberg make , model t60. , third stage suction filter element of process air compressorforhp nitric acid plant. filter type: cassettefilters - mvigt98 filter media: synthetic fibre filter grade: f9 make: freudenberg. , reverse pocket filtercum mist eliminator for second stage filtration suitable for fixing on adapter plate on the existing mounting frame of second stage filtersof air intake system of hpna process air compressor size: 558x558x340 mm filter type :hydromaxx;make: freudenberg.