Document DvGkbxjoqNL7B23Qj6OzEJMdo

Granite cutting, finishing Pneumatic hand tools Surfacing machine Grinders Polishers, buffers, eta. Portable Swing frame Type of Hood Local hood Local hood VmUlftUoa Air Ptow Uroa) Transport Velocity (fpm) Remark* and Reference* 500 cfm 500 cfm for tools np to 2% in diameter 1000 cfm for 2% to 2% in diameter 5.500-0,000 5.500-6,000 Ref. 26, 27 Typical hood 3 x 8 In with 3 in fiange Hood surrounds tool opening Standard wheel hood Downdraft bench Booth Booth (See Table 45-1) Bench type, 2-400 cfm per sq, ft of exhaust grille but not less than 150 cfm per sq ft of plan working area 100 fpm at face 100-200 fpm Indraft through opening In booth face SS i Bef 22, 28 Ref 15, 19, 22, 29 Recommended for larger parts (Usual cfm per grinder 2,000-4,000) Kitchen range Canopy 100 fpm at hood face 1,500-1,800 Provide drip gutter on all mtenor vertical waffs to catch condensed grease Ref 30 Laboratory hood (provide Booth type with door) 50-100 fpm Ref 24, 31. Air supply location very critical Metalixmg Local hood Booth 200 fpm at hood face 125-200 fpm at booth face 3,500 3,000 Ref. 15 Not recommended for toxic materials Use higher ventilation rates for toxic materials MUexs Enclosure Motion picture protector Enclosure (carbon arc) 100-200 fpm through feed and in 3,000-3,500 Ref 19,22 spection openings 12-100 cfm (for fume and gas re moval) directly exhausted from projector housing Ref. 31. 1,000-1,500 cfm or 20-30 air changes per hour for heat removal SAFETY ENGINEERING TABLES > 2 |*j *-< tq % o 5 - O ^ ^ f* t*j State or Local Regulation! Should Be Consulted and Followed Where Higher Ventilation Rater Are Specified