Air volume regulators, fitted inside a duct to maintain constant air volume within a pressure range from 50 to 200 Pa. -The airflow can be adjusted during installation. -The regulators can be used in commercial premises, both in ventilation and air treatment (max 60ºC) as well as in air extraction or impulsion. -It can be used in dwellings with double-flow installation. -Easy to fit inside the duct. -Sealing and stability provided by a foam joint. -Manufactured from flame retardant plastic (M1 fire classification), with limit of operation at 60ºC.