... 1.national patent design 2.ultra-thin wall hung 3.suction smoking rate 99% 4. ... big leader advantage 1.National patent design, ultra-thin wall hung, don't block the line of sight, don ... patent technology design side circular arc get into wind device, suction smoking rate above 99%, double flow purifying ... save time. 6.Large area oil-smoke discharge device, convenient cleaning, only need take out oil smoke ...