procurement of pre filter for air washer system under emiphii department, sgtpp,wbpdcl. , procurement of pre filter for air washer system under emiph-ii department, sgtpp,wbpdcl. , air suction filter element # ( following specifications must be followed: prefilter (washable) size: 550x550mm without flange, depth 50mm, 610x610, depth 50mm with flange and neoprene rubber gasket 2mm type : flange frame : aluminium extruded , 20swg filter media: hdpe + non woven synthetic, aluminium expended filter class (en779): g4 pressure drop in clean condition: 6 mmwg pressure drop in clogged condition: 12 mmwg efficiency: 90% down to 10 micron force velocity: 2.5m/s test code : bis6540 apart from this, sample item must be considered for actual dimentions and better configurations with 1:1 replacement. )