19. Confinement equipment must(1) be sufficiently ventilated;
(2) include a lateral wall with an opening large enough to allow the animal to see outside with ease and to easily be seen; and
(3) include a flat floor that has an incline not exceeding 4%, be non slippery and sufficiently rigid for the animal to stand up without it sagging, and designed so that the animal cannot pass through it or get stuck in it.