Ready-to-install extract air system with electrical time control for basic and demand ventilation including installation ring made of white plastic, for insertion into pipes with ND 125 mm. Basic volume flow is increased to demand volume flow using a button provided by the customer, after 30 minutes it returns to basic ventilation. Suitable for wall and ceiling installation. 230 V, 0.5 A, 3 W, IP X1, protection class II.