... request 3. ISO9001:2000 approved 4. OEM accept ThreeO HTA1 Industrial Dust Filter Bag 1. Features:1. Appropriate filter materialAccording to ... and chemical character of gas, size, weight, appearence of PM, dust loading concentration, rate of filtration, purge mode, emission concentration and ... a cap on the top, hanging on the beam of dust catcher, bottom fixed reliablyAdjust the tension to the rating, ...