Question: The National Research Council has decided to pursue research in the area of spray-dried agglomeration of nano-sized powder particles to produce micronsized powder particles. Safety and health regulations permit only a limited amount of these particles to escape into the ambient air of the space. To that end, the Council has contracted the services of Alliance Engineering Corp. to design a high-velocity duct system for a FarrR Gold Series 10 dust collector. The dust collector will draw 4000 cfm of air in an effort to eliminate any powder particles from the space.
The air will be drawn through a hood and a filter system, as shown. High efficiency, open-pleat style cartridge filters with flame-retardant media and average pressure loss of 2.7 in. wg were used. A commercial shop environment will be provided by the Council, in which the maximum duct velocity can be on the order of 2500-6000 fpm. Size and specify the round ductwork between the hood and the duct collector. The layout, accessories, and fittings that are chosen should be such that losses are kept at a minimum. Specify an appropriate fan or blower. Further Information: Given that this is an industrial application, the designer may consider specification of a utility or industrial centrifugal fan.
