What is the bag filter AI Overview What is Bag Filter?. A Bag Filter is an air pollution… | by ... A bag filter is an air pollution control device that removes particulate matter from industrial gas streams by passing the gas through a housing containing multiple cylindrical filter bags, or fabric bags, that trap dust and other particles. Also known as a baghouse or fabric collector, it's used in many industries, including power generation and manufacturing, to control emissions, protect equipment, ensure product purity, and comply with environmental regulations by capturing dust, smoke, and fumes.