The amount of dust held by a filter to its recommended final pressure drop.

(Air Handling Unit) A system comprising of a fan and ductwork in which a filter(s) is placed.

The volume of air passing through the filter

A device designed to remove suspended particles from air flowing through it.

A measure of the ability of a filter to remove a standardised test dust from the air passing through it under given operating conditions. Expressed as a weight percentage.

Plate or vane used to direct or control movement of fluid or air within a confined area.

British Standard in Ventilation and room-conditioning for non-residential buildings

British Standards Institution relating to the provision of standards across management systems, business improvements and regulatory approval.

Removal of gases from an airstream by the chemical reaction of gas with an impregnant on the surface of or distributed throughout the filter.

(Dust Holding Capacity) Amount of loading dust retained by the filter up to the final pressure drop.