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fans. with both high cooling performance and low power. consumption during operations. This document introduces the features and performance. of the high static pressure 60 mm sq., 76 mm thick counter. rotating fan?? San Ace 60?? CRA type that was developed to. meet these market demands....

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Fans create a flow of air, which they can then force through equipment that needs cooling. The necessary output is determined from the flow rate and the required static pressure. If the airflow through the equipment is restricted to any great extent by built-in components or bends and junctions...

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...and pressure over its entire area. Any well-designed fan wheel is sure to have two characteristics. 1. The individual blades will be narrow at the tip, where the blade velocity is high, and will widen toward the hub, where more blade area is required due to lower blade velocity. 2. The angle...

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An axial fan in general, whether DC axial fans or otherwise, is the most commonly used variety of cooling fan, as well as the most cost effective. Also called 'box fan' on occasion, they move air on a straight axis through the fan. This kind of fan functions best under a low pressure or low system...

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...the performance characteristics of various fan types, like areas of instability, or the rate of change between flow and pressure. With some basic knowledge of performance curves, decisions can be made concerning fan selection, fan and system alterations, or the advisability of using a fan in a modulating...

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A fan system may require field testing when the system is thought to be malfunctioning, needs modification or requires balancing of its volume and pressure characteristics....

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Fan performance changes with the density of the gas being handled. Therefore, all fans are cataloged at a standard condition defined as: 70°F. air, at sea level, with a gas density of .075 lb./ft^3 at a barometric pressure of 29.92" Hg. At any other condition, the fan's horsepower requirement...

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The most important requirement of a fan wheel is that it must impart to the air stream a uniform velocity and pressure over its entire area. Any well-designed axial flow fan wheel is sure to have two characteristics: 1. The individual blades will be narrow at the tip, where the blade velocity...

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...in a variety of applications. The trend in recent year s for informat ion and communications devices to have high performance and down - sizing has resulted in higher - density devices. This has created a demand for cooling fans to achieve higher cooling performance (air flow - static pressure characteristics...

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In general terms, a pressure blower provides relatively high pressure at low volume when compared to other types of centrifugal fans. For purposes of this letter, fans with volumes. to 10,000 CFM with pressures to 80" WG are considered pressure blowers. Typical applications require constant...

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