Floor ventilator. Popular finishes: anodized silver,satin nickel. 1. Aluminum ventilator for underground, floor.2. Popular finishes: anodized silver, brush nickel.3. Size available: width 50/80mm,length:150/200/225/250/300/400/500/600/800/1000mm.4. Welcome for inquiries or samples or trial order. Our sales team are ready to make it for you!! ventilator for underground