A Reverse Air Dust Collector also known as reverse flow baghouse and reverse flow fabric filter refers to a dust collector using a reverse-air cleaning system to remove the collected dust particles from the surface of the filter media by backflushing the filter bags with a low-pressure reversed flow.
The cleaning is motivated by a separate cleaning fan which is normally much smaller than the main system fan since only a fraction of the total system is cleaned at any one time.
Most often, reverse air dust collectors are comprised of a number of isolatable compartments. Normally the dust is collected on the inside of the filter bag, the filter bag being open at the bottom and closed at the top.
The filter bag will contain rings to keep it from collapsing completely during the reversal (which would prohibit cleaning since the dust particles would be unable to fall down within the filter bag to the hopper).