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Mixed flow fans combine characteristics of both axial and centrifugal fans, and in the Howden design the impeller resembles a fixed pitch axial fan. Howden has two ranges of mixed flow fan: one heavy duty, ideally suited for handling dust-laden gases, and a compact range that gives higher pressure rises than can be obtained from similar sized axial fans. Our heavy-duty fan is extremely robust, with plate blades that are ideal for handling dust-laden gases at elevated temperatures. Though a mixed flow fan is not as efficient as other types and the operating range is more limited, fan performance is less degraded by erosion or corrosion. Should repairs be needed the blades are easily welded. Heavy duty mixed flow fans are available with flows from 200 to 800m3/s and pressure rises up to 8kPa.Our compact mixed flow fan, originally marketed by Airscrew Howden, is a fully ducted, in-line machine that has a non-overloading power characteristic. It is capable of operating throughout its pressure/volume curve without stalling, even at zero flow. This fan is ideally suited to applications where space is limited and, for example, is commonly used for ventilation on offshore oil platforms. Its robust design maximizes reliability and, with anti-spark features, it is suitable in zone 1 hazardous areas. Belt and motor drive options are available. The range can produce flows up to 80m3/s at pressures up to 3kPa.

Manufacturer’s Website www.howden.com   Associated Systems Fans