What is the definition of a VAV filter? VAV filters, or variable air volume filters, are air filters that are designed to control and improve air quality for heating and cooling systems. This type of filter is designed to reduce the amount of dust and debris in the air and allow for more efficient operation of the system. VAV filters are typically comprised of a series of layers of filter media, such as activated carbon, which works to trap and absorb particles, dust, and other pollutants in the air. In addition, these filters also reduce noise levels and improve the overall air quality. VAV filters are also used to regulate the temperature and humidity levels in an environment. The filter is adjusted to meet the desired temperature and humidity levels, which helps to increase comfort and efficiency. VAV filters are an important part of any air conditioning system, as they help to maintain a healthy air quality, reduce noise levels, and improve efficiency.