Stianless steel air vent cap Construction:Ø Frame & inner louver:: High quality strong 304 stainless.Ø Size:φ60mm , φ70mm , φ80mm , φ100mm , φ110mm , φ125mm , φ150mm , φ160mm , φ180mm , φ200mm , φ250mm , φ300mmDescription:Ø The frame & blades are high quality strong 304 stainless steel construction with advantages of corrosion resistance and rigidity.Ø This type of air vent is incorporated with a set of louver blades. It is is commonly used as exhausted outlet and ventilation on the exterior walls of washrooms, kitchens, warehouses, houses,apartments, condominiums, gymnasiums...ect.Ø There are inverted spring hooks located on the neck , which are used to secure the device onto the wall or duct.Ø There is air filter inserted.