Hepa Filters
HEPA stands for "High-Efficiency Particulate Air" [1]. A HEPA filter is a type of air filter that satisfies certain standards of efficiency such as those set by the United States Department of Energy (DOE). By government standards, a HEPA air filter must remove 99.97% of all particles greater than 0.3 micrometer from the air that passes through.
Bag Filters
Bag filter a pressure filter where fabric bags are installed inside a cylindrical housing (pressure vessel) and the filtered liquid is pumped through the bag walls. Liquid flow is from the inside to the outside of the bag - dirt is trapped inside the bag. These pressure vessels must be ASME (American Society of Manufacturing Engineers) coded.
