supply of filter bag (dia 152 x 6250 mm long) , filter bag (dia 152 x 6250 mm long) for secondary fume extraction system a s per rwf drg no. 711900310580. note: (a) five nos. sample should be supplied for approva l before bulk supply. (b) material test certificate for various parameters of fabric as p er drawing must accompany the supply. (c) a cloth lable indicating the supplier name & p.o no. & date shall be stiched at the hand grip, for each bag for identification. (d) filte r bag: polyster needle felt with ptfe coated having water replellant quality. as per drg no. 711900310580 specn: as per rwf drg no. 711900310580 ]