Our technology was introduced from Australia but price is lower than that in Australia. Our products are praised highly by lots of clients. we can make two materials:1. Fluorocarbon Polyester Coating Aluminum Alloy 2.304/2B Stainless Steel. Our fluorocarbon polyester coated aluminum alloy ventilator is our hot-sale product which owns many unique merits. On the surface of aluminum alloy has anti-oxidized fluorocarbon polyester coating which makes ventilator anti-corrosive, anti-rust, weather resistant, light weight and superior revolving ability and long service life. We use Japanese Steel NSK bearing which is self lubricating. With regard to size, we can make 200mm, 300mm, 500mm, 600mm and 900mm. 900mm is straight vanes.