Round and flat diffuser Material: galvanized steel Size:80,100,125,150,160,200,250 Color: ... RAL9010,RAL9016) Aluminum alloy round Air Diffuser1) Material: galvanized sheet steel, powder coated white(RAL-9010).2) Circular style air diffuser ... 2) High precision, rigidity and consistency 3) Strong corrupt proof, weather proof and chemical proof 5) Flexible suspension system makes it easily installed and ...