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International Symposium on Ventilation for Contaminant Control; American Conference of Governmental Industrial Hygienists;

PRELIMINARY STEPS Coordinate design efforts with all personnel involved, including the equipment or process operator as well as maintenance, health, safety, fire, and environmental personnel. The designer should have, at a minimum, the following data available at the start ofthe design calculations: I. A layout of the operations, workroom, building (if necessary), etc. The available location(s) for the air cleaning device and fan should be determined. An important aspect that must be considered at this time is to locate the system exhaust point (where the air exits the system) so that the discharged air will not re-enter the work space, either through openings in the building perimeter or through replacement air unit intakes. (See Figures 5-28 and 5-29.) 2. A line sketch ofthe duct system layout, including plan and elevation dimensions, fan location, air cleaning device location, etc. Number, letter, or otherwise identify each branch and section of main duct on the line sketch for convenience. The examples show hoods numbered and other points lettered. Locate the fan close to pieces of equipment with high losses. This will facilitate balancing and may result in lower operating costs