WHERE TO PLACE THE SYSTEM

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WHERE TO PLACE THE SYSTEM ı
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Step three is to decide where it all fits. Assume the room is 30" long, and the collector and one welding station are installed at opposite ends. Given this distance, the system losses, which include the hood, duct, elbow, collector and fan stack, are calculated at 8.0 in. water gage, a measure of air flow resistance. At that point, the collector and the fan can be properly sized.

For a typical welding application involving carbon steel material, the normal air-to-media ratio is approximately 2.0 to 2.5:1. That is 2 to 2-½ cfm of air for every one ft. of filter media. If we use 3,000 cfm and divide that by the air to media ratio (2.5), that produces a requirement for 1,000 ft. of filter media. That value is then divided by the square feet of media in the filter.

ıPhil Weber, Welding Processes Pose Tough Challenge for Fume Filtration, (Welding Design and Fabrication) 9/03

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