Panel and pleated air filters are installed in HVAC systems to remove contaminants from the air stream. They help improve indoor air quality and prevent the contaminants from building up in the equipment and damaging it. These filters are typically less than 6" deep and provide low to moderate levels of filtration. They can be used as pre-filters or final filters. When used as pre-filters, they protect the more expensive final filters downstream from large particles, which extends the life of the final filters. Non-pleated panel air filters are commonly used in office buildings, schools, universities, and work areas where surface finishing is performed. Pleated air filters are a good choice for healthcare facilities, pharmaceutical plants, industrial applications, hospitality sites, and other areas where a higher level of filtration is required than non-pleated filters can provide.