6", 150mm PLASTIC AIR VALVE for Extractor Fans, Ducting, Ceiling Grille Vent
6", 150mm dia :- Neck Ducting Size, Overall Flange =. (6"):-150mm, White Plastic Adjustable Air Valve Vents complete with Long Neck Spigot and Locking Ring. The (EVP) is an exhaust diffuser for installation in ceilings or walls.