6.1 Sieves:
6.1.1 Use sieves conforming to Specification E 11. For
recommended sizes see Table 1.
6.1.1.1 For RDF-3 and larger than 50 mm (2 in.) screens
having rectangular frames 0.6 to 0.7 m2 (6 to 8 ft2) sieve area
are satisfactory.
6.1.1.2 For RDF-3 50 mm (2 in.) or smaller, rectangular
frames having 2 to 4 ft2 (0.2 to 0.4 m2) sieve area are
satisfactory.