Pocket filters are filters used in HVAC applications to remove dust from ambient air. They are commonly used as final filters in commercial applications or as prefilters for HEPA filters in hospitals in the Pharmaceutical Industry.

The filter is made with pieces of media, sealed together to form pockets. Each bag air filter can have a specified number of pockets, whether they be 3 pocket bag filter, or 6 pocket bag filter, the pockets themselves can vary in length. With these combinations of pockets and lengths, many surface areas sizes can be created. Generally, a larger surface area will give you better Dust Holding Capacity (DHC) and longer service life of the filter.