Hood Design Procedure - Cat Vacuum

1 hood Design DATATABLE 1 RANGE OF CAPTURE VELOCITIESC ondition of Dispersionof ContaminantExamplesCapture Velocity, fpmReleased with practically novelocity into quiet from tanks, degreasing, - 100 Released at low velocity intomoderately still booths; intermittent container filling;low speed conveyor transfers; welding;plating; pickling100 - 200 Active generation into zone ofrapid air painting in shallow booths; barrelfilling; conveyor loading; crushers200 - 500 Released at high initial velocityinto zone of very rapid air ; abrasive blasting, tumbling500 - 2000 In each category above, a range of capture velocity is shown. The proper choice of values depends onseveral factors: Lower End of Range Upper End of Range1. Room air currents minimal or favorable to capture.

3 Table 2. RANGE OF DESIGN VELOCITIES Nature of Contaminant Examples Design Velocity Vapors, gases, smoke Fumes Very fine light dust Dry Dusts and Powders

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