7 Pa. Code § 37.113 – Design and construction in the nonfood products zone.

(a) Safety and gear guards shall be removable for cleaning and inspection.
(b) External surfaces shall be free of open seams, gaps, crevices, unused holes and inaccessible recesses.
(c) Horizontal ledges and frame members shall be kept to a minimum. External angles shall be rounded and internal angles shall be avoided.
(d) Where lubrication of equipment is required provision shall be made to prevent leaking or dripping into the food product zone.