Double-layer adjustable mutil-vane air diffuser Feature: 1)aluminum alloy material. 2) the vane angle will be 30íp 3) the double deflection blades are adjustable. 4) can add obd or fliter as your requirement. 5)easy installation and maintenance 6) natural anodized aluminum finish or powder coated Outer standard size: as per your request(face size=neck size+158mm) Neck size: a*b(size is as per your request) Blades:19*3.8mm style, 23mm space Vane space:40mm High:76mm Flange width: 32.5mm Order notes: item-neck size aíßb-color/(obd/filter or not) Functions: mutil-angle for air supply or return Use: for floor, ceiling, wall, sidewall, door, air conditioner application, in broadcast room, hospital, theater, guest room Packing:normal packing (each diffuser packed with a piece of wrapper, and then put into the carton separated with a cardboard) Models