Specifications: Product name: Exhaust ventilation Model: 100, 125, 150 material: stainless steel Color: silver Diameter: Approx. 100mm / 3.93 , 125mm / 4.92, 150mm / 5.9 Packaged included: 1x stainless steel exhaust diffuser Characteristics: > - Can be used for supply or exhaust air, for installation in ceilings or walls, at low noise. - Has a lockable central cone which is turned to adjust the pressure and therefore the air volume. - By installing the sleeve and the adjustable face mask composed of two parts, quick and easy disassembly of its upper part. - Continuous air regulation by a rotary valve disc, lockable with a lock nut. - Can be installed in the ceiling loading wall, play a rule, filter, and embellish the role of decoration.