Bag filters are cylindrical or rectangular fabric containers that capture dust and particles from airflow in commercial and residential HVAC systems. These filters extend into the filter housing, creating additional surface area compared to flat panel filters. Bag filters typically offer MERV ratings between 8 and 13, making them suitable for general dust control and moderate air quality improvement.
Design and Capacity
Bag filters feature multiple compartments—usually 2 to 6 bags per housing—that increase dust holding capacity to 2 to 4 pounds before requiring replacement. Constructed from woven fiberglass or synthetic fibers, they maintain structural integrity during 4 to 12 months of typical operation. Installation in filter housings requires proper alignment and secure fastening to prevent bypass and maintain system efficiency.
Applications and Performance
Bag filters excel in commercial HVAC applications, industrial facilities, and larger residential systems handling higher airflow volumes. They reduce pressure drop compared to multiple panel filters in series, minimizing strain on blower motors. Their larger dust capacity extends replacement intervals and reduces maintenance costs, though they are non-washable and require complete replacement upon saturation.