3717-1-06.1(M)(4) Physical facilities: design, construction, and installation

Except as specified in paragraphs (M)(2) and (M)(5) of this rule, if the windows or doors of a food service operation or retail food establishment, or of a larger structure within which a food service operation or retail food establishment is located, are kept open for ventilation or other purposes or a temporary food service operation or temporary retail food establishment is not provided with windows and doors as specified under paragraph (M)(1) of this rule, the openings are to be protected against the entry of insects and rodents by:

(a)

Sixteen mesh to one inch (sixteen mesh to 25.4 millimeters) screens;

(b)

Properly designed and installed air curtains to control flying insects; or

(c)

Other effective means.