5.2.2. The rooms of the grading station must meet the following requirements:(1) the floors, walls and ceilings must be:(a) covered with a hard material;
(b) smooth, washable and waterproof;
(c) free of indentations, holes and cracks;
(2) windows opening onto the outside must have screens kept in good condition;
(3) the doors must fit, not open directly onto the henhouse, and must be kept closed between uses.