Type FWPV vent filter housings are designed for venting tanks at atmospheric conditions (pressure equalisation), i.e. when filtered air must be feed or exhausted from tanks due to changing filling levels. In most cases type FWPV vent filter housings are used in conjunction with EFSTP-STPL sterile filter elements. Type FWPV vent filters must not be used if the tank the filter is related to is not equipped with a suitable safety valve and burst plate for overpressure and vacuum protection.

Type FWPV vent filter housings are made from stainless steel, manufactured in a deep drawing process with final assembling by welding processes. For surface finishing purposes

the filter housings are electro polished inside and outside, additionally mechanically polishing is provided on the outer side. Each type FWPV vent filter housing is designed for one filter  element of type EFSTP to be inserted. In most cases filtration grade STPL for sterile filtration is used while other filtration grades can be equipped as well, depending on the application. Connection and sealing between filter element and filter housing is provided by a double O-ring bayonet coupling. 

The housings are provided with a threaded connection (connection size depends on the model) while many other connection types are available on request. The  connection links to the inside of the fitted filter element. The outside of the filter elements is directly connected to atmosphere. 

A stainless steel bowl offered by the vent filter housing protects the fitted filter element, locked to the connection body and secured by means of a knurled screw.