HVAC air filters are used in heating, ventilation and air conditioning (HVAC) systems to improve air quality by removing unwanted particles from the air. These particles might be gases, odors or larger debris, depending on the environment that the system is in. HVAC air filters usually consist of a frame of plastic or metal covered by a fibrous material.
Air filters are generally composed of a gauze-like material that allows air through while stopping larger particles from getting past. They collect this debris and need to be washed or replaced when they become clogged or worn out. If they are not properly attended to, elements in the ventilation system may overheat or cease to function properly.
The main way that HVAC air filters differ is in the material used for the filter. This depends on your needs. A simple pleated filter will prevent debris such as dust getting into the system, whereas something more complex such as odour removal will require a charcoal element in the filter.