The animal quarters shall be provided with proper lighting, ventilation, and heating to maintain comfort of the animal except where the provisions of Section 1155 otherwise provide. Equipment must be adequate for the proper care and treatment of all animals kept or used. Cages, or other enclosures, shall be large enough to permit reasonable freedom of movement. Adequate facilities shall be provided for keeping animal quarters and equipment clean. Overcrowding must be avoided in order to limit the transmission of animal diseases. The animals shall be maintained in a room separate from any other activity of the establishment, or under other physical conditions satisfactory to the department.