supply of filter bag ( i / d 150 mm x 4050 mm long ) for fume extraction system-3 to rwf drawing no 721900310590. note: a ) five numbers as sample should be supplied for approval before bulk supply. b ) material test certificate for various parameters as per drawing must accompany the supply. c ) a cloth lable indicating the suppliers name and po reference shall be stiched at the hand grip for each bag for identification purpose. , pleated filter bag and snap band to suit to bag holding plate hole dia:160mm for primary fume extraction system 1 & 2 rwf drawing no. 741900310450. note: a ) snap band fabric: non woven needle felt polyster. b ) material test certificate for various parameters specified in the drawing shall accompany the supply. c ) two numbers sample shall be supplied for approval before bulk supply. d ) the supplies shall be guaranteed for quality, workmanship and performance for a period of 18 months from the date of supply or 12 months from the date of fitment whichever is early. any replacement during this period shall be free of cost.