It is a Washable Air Filter (FILTER UDARA), made of high strength polyester with gradual density. Low compressibility keeps its shape and makes fiber purified air effectively. It can absorb the excess particles during paint-spraying operation and reduce pollution to the environment HVAC (AHU /FCU) System, make the exhausted air more environmental-friendly and inner circulating air more clean. -w ashable and reusable -Low initial resistance -Large dust holding capacity -Flexible -Economical and practical Application:Used in the places where need washing and filtering, pre-filter through air filter program Type: supply pads or rolls size Media: synthetic fiber with gradual density Washable: about 7-8 times Honesty service and pursuing perfection we are committed to providing the best products and comprehensive after-sales service for all customers over the country.