Viledon pocket filters and NanoPleat cassette filters are predominantly used for filtering the intake, exhaust and recirculated air flows in air-conditioning and ventilation systems. Offices and computer rooms are typically popular applications. Indoor climate control is designed to provide optimised climatic conditions to ensure people and machines do give their best. The proper air conditions are created by indoor climate control systems, which heat, cool, dry, humidify and filter the air involved. A modern alternative to conventional pocket- or cassette filters are combination filters like the Viledon® DuoPleat - besides particle filtration they also offer the capability of removing unwanted gases and odours in a single filter element.