4.1.7.3 Access
openings shall be provided in all storage bins. The openings
shall be at least 18 inches (460mm) in its smaller dimension
and shall have exterior rims raised at least 1 inch (25mm). Covers
or filters for all openings shall be designed to permit ready
replacement and sealing. Bins shall have an access opening not
more than 48 inches (1.25 meter) above the discharge opening.
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