100mm / 4 inch Stainless Steel Ceiling Exhaust & Supply Valve The Kair air valve is ideal for moderate ventilation in all rooms that have no special fire protection requires. The disc valve can be used both for supply and exhaust air. It is made of stainless steel with a brushed finished, making it weatherproof and suitable for use in outdoor areas. The wide edge evens out potential bumps on the wall or diameters of the opening. The corresponding mounting ring ensures a stable hold in thin materials such as ceiling panels or metal ducts, at the same time the ring also serves as a connection piece to flexible tubes. It has a male spigot for connection inside of the system 100mm duct. Spigot 96mm Connects with 100mm / 4 inch size ducting Minimum free area of 3,479mm² with Control Disc 10mm open Supplied complete with a fixing body with pre-drilled holes for installation The extract air valve is fully adjustable and has a locking nut to fix the position of the controlled disc upon commissioning. Manufactured in compliance with Domestic Plastic Ductwork Specification DW/154 and does meet UL94HB flammability standard. Ideal for ventilating toilets, cloakrooms, bathrooms, en-suites as well as heat recovery ducting systems.