Airfoil Manufacturing Radial Swirl Diffuser type CDS DM350 have 22 fixed vanes. The CDS DM350 swirl is a highly versatile diffuser that has the ability to handle lower to mid range air quantities whilst still being able to maintain the desired supply air swirl pattern. The CDS DM350 is ideal for use in a variety of applications and is particularly suited to office blocks, hospitals and shopping centres or any place where the even distribution of air is paramount.