Hison Axial Flow Fans, previously known as Howden Fans, are produced to meet International Quality Standards, offering sizes ranging from 150mm to 1250mm in diameter. These fans feature heavy-duty marine grade LM-6 or equivalent cast aluminum impellers with aerofoil blades for enhanced efficiency and reduced sound levels. The adjustable blade angles cater to various volume and pressure system needs, with a blade shank design that includes a tapered conical section for a secure fit. The impellers are available in polypropylene and aluminum materials.