Washable Panel Filter is ideal to be installed in HVAC systems for removing contaminants from the air stream. It makes indoor air quality better, and prevents the contaminants and pollen from building up in the equipment as well as damaging it. It is commonly less than 6" deep and offers low to moderate filtration levels. It can be utilized as pre-filters, because it protects the more costly final filters downstream from wide particles, which prolongs the life of the final filters. Washable Panel Filter is effective for central air-conditioning range hood & filtration, high humidity resistance filtration and special ventilation of acid and alkali.