(1) Except as specified in subsections (2) through (5) of this section, outer openings of a food establishment must be protected against the entry of insects and rodents by:

(a) Filling or closing holes and other gaps along floors, walls, and ceilings;

(b) Closed, tight-fitting windows; and

(c) Solid, self-closing, tight-fitting doors.

(2) Subsection (1) of this section does not apply if a food establishment opens into a larger structure, such as a mall, airport or office building, or into an attached structure such as a porch, and the outer openings from the larger or attached structure are protected against the entry of insects and rodents.

(3) Exterior doors used as exits need not be self-closing if they are:

(a) Solid and tight-fitting;

(b) Designated for use only when an emergency exists, by the fire protection authority that has jurisdiction over the food establishment; and

(c) Limited-use so they are not used for entrance or exit from the building for purposes other than the designated emergency exit use.

(4) Except as specified in subsections (2) and (5) of this section, if the windows or doors of a food establishment, or of a larger structure within which a food establishment is located, are kept open for ventilation or other purposes or a temporary food establishment is not provided with windows and doors as specified under subsection (1) of this section, the openings must be protected against entry of insects and rodents by:

(a) 16 mesh to one inch (16 mesh to 25.4 mm) screens;

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

(c) Other effective means.

(5) Subsection (4) of this section does not apply if flying insects and other pests are absent due to the location of the establishment, the weather, or other limiting condition.