Ventilation valves BWC series valves are designed for the air supply or air exhaust in airconditioning, ventilation or heating installations. Especially suitable for air exhaustion in washrooms and for ventilation installation in housings, offices, schools and hospitals . It is mounted in walls or false ceilings. BWC valves allow a high airflow pass obtaining good results in sound pressure performance. Flow is easily adjusted by turning the centre part of the valve.