Document OE18J22vbgdQwLDE7V32rQxrL

1021 Shakeouts Foundry Spray coating Tanks, open surface Tumbling mills Hollow trunnion type Tumbling mills, drums, cages, barrels Enclosure Booth--operator in side Booth-operator outside Booth--downdraft (See Table 47-L) 200 fpm through all openings in enclosure, but not less than 200 cfm per sq ft of grate area 100-200 fpm at booth cross sec tion 150-200 fpm at booth cross sec tion 100-200 fpm downdraft Exhaust connection by manufacturer Enclosure Use branch diameter same size as exhaust outlet For round mills branch diam should be V, diam of mill, for square mills branch diam should be 1 in plus /, side dimension of mill 400 fpm through openings but not less than 75 cfm sq ft plan area Welding Local hood with flange Downdraft bench Booth 6 in from arc-150 cfm 6-9 in from arc-275 cfm 8-10 in from arc-425 cfm 10-12 in from arc-600 cfm 150-250 cfm per sq ft gnlle area 100 fpm at booth face Woodworking Miscellaneous Packaging machines, granulators, enclosed dust producing units Packag ing, weighing, container filling, inspection (See Table 47-K) Complete enclosure Booth Downdraft 100-400 fpm indraft through in spection or working openings, but not less than 25 cfm per sq ft of enclosed plan area 50-150 cfm per sq ft of open face area 75-150 cfm per sq ft of dust pro ducing plan area From ASHRAE Guide and Data Book, 1970, Chapter 20 Uted by permission 3,500 1,500-2,000 1500-2,000 1,500-2,000 3,500-5,000 3,500 2,000-4.000 2,000 2,000 3,000 3,000 3,500 Use higher ventilation rate for small booths 4 sq ft or less Where equipment is enclosed and dust tight dunng rotation, enclosure may not be needed if feed and discharge opera tions can be otherwise run