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CENTRIFUGAL FANS |
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Engineered To Your Requirements |
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Operating Range for Centrifugal Fans
We welcome the opportunity to quote for the manufacture of fans for any application which falls within the above operating range.
The main type of centrifugal fans are characterised by the type of impeller blades:
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BACKWARD CURVED AEROFOIL BLADES |
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Series MAVA, MAVX, MAVZ |
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Designed for airstreams requiring very high efficiency and quiet operation.
The aerofoil cross section allows air to flow through the wheels with less turbulence than is created with a conventional backwardly inclined fan. This has two advantages: the fan is quieter; and it can be designed to function smoothly without surging or pulsation through almost its complete performance range. It gives stable operation through a wide performance range with the highly desirable non-overloading characteristics.
Centrifugal fans can be made single width single inlet (SWSI) or double width double inlet (DWDI).
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BACKWARD INCLINED BLADES |
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Series MVA, MVW, MVX, MVZ |
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Backward inclined centrifugal fan designs generally represent high efficiency and cost effective centrifugal fans for both clean air and light dust loads. The absorbed power curve has a flat peak non-overloading characteristic. These fans can surge or pulsate when their air volumes are reduced to the point where they operate to the left of their pressure peaks.
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RADIAL TIPPED BLADES |
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Series MVR |
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| The radial-tipped impeller has curved blades which lie finally in a radial direction at the periphery. It has a shrouded impeller and, for a given size and speed, develops higher pressures than backward-bladed fans. It has a rising power characteristic. Medium efficiency fan suitable for most industrial applications with light to medium dust. Self cleaning blades prevent the build up of dust which would cause out of balance. |
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RADIAL BLADES |
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Series M for Material Handling |
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CHOPPER IMPELLER |
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The radial blades are welded to a conical backplate with an open front. This impeller has polished surfaces and is designed for handling continuous paper trim. The blades of the impeller have sharp and hardened cutting edges, which can be supplied as a bolt-on option.
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RADIAL BLADES |
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Series HP for High Pressure |
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The HP series centrifugal blowers have a narrow width, fully shrouded radial bladed impeller, suitable for clean air applications such as combustion air, fluid bed aeration, blow off, cooling, conveying, drying and high pressure industrial process systems. |
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FORWARD CURVED BLADES |
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Multivane |
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Forward curved type are characterised by a large number of curved shallow blades sloping forward or in the direction of rotation. It will handle relatively large volumes of air at a low pressure duty at lower operating speeds, but the total efficiency is somewhat less than that of backward inclined fans.
The forward curved multivane impeller is used in general ventilation for clean air applications only. It is particularly useful when a low noise level is required. |
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ACOUSTICALLY LAGGED
Centrifugal Fans |
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| The Aerotech range of centrifugal fans can all be acoustically lagged to reduce radiated noise from the fan casing. The whole casing is double skinned and insulated with sound absorbent material. It is more economical to purchase a lagged fan than to acoustically insulate the fan casing on site to meet the necessary noise requirements. |
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PLUG UNITS & HIGH TEMPERATURE FANS |
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The Aerotech plug units are solidly welded, non-overloading fans which can be square panel mounted to the side or top of oven dryer panel. The mounting panel is insulated. These fans are designed for internal operation in furnaces, ovens or kilns where air has to be exhausted, re-circulated, or distributed. Plug units eliminate ductwork and special mounting platforms.
Aerotech make a wide range of both axial and centrifugal high temperature fans. Materials are selected to have sufficient high-temperature tensile strength, creep resistance and withstand cycle fatigue. Common heat-resistant nickel-base alloys include stainless steel, Incalloy, Inconel, Multimet, Haynes etc. The fan design will take into consideration: *materials of construction for the impeller, shaft, hub and casing, *casing insulation, *bearings and lubrication. Large diameter shaft design functions as a significant heat sink and cooling can be achieved using water, oil, nitrogen or compressed air. Bearings are kept out of the airstream, the inboard bearing is moved away from the fan casing to fit a heat slinger. Bearings are selected to allow for the thermal growth ie. shaft to move lengthwise. |
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| INLINE CENTRIFUGAL FANS |
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The Aerotech inline centrifugal fans are heavy duty industrial type, non-overloading fans which are quiet and compact. The consolidation of the centrifugal wheel in a tube with guide vanes produce a highly efficient performance characteristics comparable to scroll type centrifugal fans but with minimum space requirements similar to that of axial flow fans. The tubular design eliminates the need for duct turns and transition pieces, thus providing simpler and less costly installation. The inlet and outlet diameters are identical and the fan can be mounted vertically or horizontally. |
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