Variax Axial Flow Fan Brochure
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VARIAX® AXIAL FLOW FANS CONTINUALLY SETTING NEW STANDARDS

The VARIAX® variable pitch axial fan combines one of the highest efficiency levels available today with an exceptionally flexible, customer focused design, manufacturing and aftermarket service. With almost 3000 units sold worldwide, the VARIAX® fan is the proven, reliable and robust choice across a wide range of applications. NORTH AMERICA Illustration of a two stage fan mounted on rollers to provide easy on-site maintenance Howden Mexico SOUTH AMERICA A TOTAL HOWDEN COMPANIES ] Worldwide locations HOWDEN DENMARK: A DIVISION OF HOWDEN GLOBAL The VARIAX® is designed and engineered by Howden...

VARIAX® FANS IN ATYPICAL POWER PLANT ARRANGEMENT The principle of adjusting the pitch of the blade to govern aerodynamic performance is the proven route to optimum efficiency, enablingthe fan performance to be accurately matched to its duties in real time while allowingthe drive motorio run constantly at its recommended speed THE RIGHT CHOICE FOR ALL APPLICATIONS VARIAX® fans are found in avvide spectrum of situations where high volumes, high pressures and precise flow control are required, and where reliability and continuous running for months on end are demanded. They are the fans of...

Design adaptability VARIAX® fan blades can be supplied in a wide range of lengths, profiles and materials including aluminium, nodular cast iron and steel. Blade attachment The blade is attached to its pivot by a single threaded connection with a key, and the fit between blade and hub is superbly designed and engineered to the most exacting standards. In addition to facilitating blade replacement, the design reduces the risk of corrosion. The use of a single pawl into the blade root also helps to keep the airstream smooth and brings a measurable increase in efficiency. The clearance between...

CONTINUAL IMPROVEMENT The VARIAX® fan is the subject of continual research and development, and the interchangeability of parts makes it possible to retrofit, adapt and upgrade with ease. For example, the recent super high pressure blade profile brought a pressure increase of up to 30% while raising the flow by up to 15% and allowing a smaller hub. In 2009 we introduced a new hub design which makes it possible to design smaller primary air fans and forced draught fans, and to upgrade existing fans to cope with higher pressure. FABRICATED HUBS FOR BETTER STRENGTH finite element method BLADE...

LIFETIME COMMITMENT All our service is underpinned by a full lifetime commitment to the equipment we supply. Our solutions will assure that you minimise the total cost of ownership. Like our fan itself, our service is designed to be flexible, reliable and responsive to customer requirements. PRODUCT LIFE CYCLE SUPPORT • Regular monitoring and inspections as well as troubleshooting and emergency service • Complete programme of spare and replacement parts • Retrofit solutions: changing of performance, life extension/longer service intervals, upgrading features and adding new features. GLOBAL...

Paper from well- managed forests VARIAX® fans offer outstanding efficiency and reliability. In a study covering more than one million hours of duty, we found that the fans we have installed have established a reliability rating of over 99%. Only the very highest standards of design and engineering can deliver such results. Ease of maintenance and low power consumption make VARIAX® the most economic option in both the short and the longterm, and our ability to precisely match customer needs and build in compatibility with future developments allows VARIAX® customers to take full advantage of...