Purpose: can be used as the pre filter in commercial buildings and various industrial ventilation systems, such as pharmaceutical, automotive and food manufacturing industries.

Introduction: this series of pocket filter using firm, leak-proof design, trilateral sealed to prevent retraction or avulsion. The way of airflow inside the bag is sewing breadthwise, and sealed with a thermoplastic seal gum. Its special structure insures airflow throughout the bag balanced, reduces the resistance and maximize the dust capacity.