What type of filter is used to extract noxious odours from an air distribution system?

An activated carbon filter is specifically designed to adsorb a wide range of noxious odors and gaseous pollutants from the air. The process of adsorption involves the adherence of gas molecules to the surface of the activated carbon, which has been treated to have many small pores that increase its surface area. This makes it highly effective at capturing volatile organic compounds (VOCs), smoke, and other unpleasant odors that can accumulate in an air distribution system.

In contrast, HEPA filters are primarily designed to capture particulate matter, such as dust, pollen, and allergens, rather than gases and odors. Fiberglass filters are used for basic filtration and generally do not provide significant odor removal in air systems. Magnetic filters are not directly related to air filtration but rather are a type of separator typically used in fluid systems to remove metallic particles. Thus, the activated carbon filter is the most suitable choice for addressing odor removal in air distribution systems.