(1) Walls, floors and ceilings must be constructed to permit them to be readily cleaned.

(2) Exterior windows and doors must be weather stripped during cold weather.

(3) Screens must be provided for outer doors and windows during any season when insects are prevalent.

(4) Heating facilities and adequate fuel must be provided with which employees may maintain a comfortable temperature as weather conditions may require.

(5) Lighting, by windows and/or acceptable artificial illumination, must be provided.

(6) Ventilation must be provided by windows opening directly to the outside air.

(7) Beds, bunks or cots with proper mattresses must be provided. The beds, bunks or cots must be raised at least twelve inches above the floor and be located two feet or more from the side of any other bed, bunk or cot located in the same room, and have at least twenty-seven inches of clear space above it.