Lockers are 1. (usually) physically joined together side by side in banks, and are commonly made from 2. (steel) although wood, laminate, and plastic are other materials sometimes found. Steel lockers which are banked together share side walls, and are constructed by starting with a complete locker; further lockers may then be added by constructing the floor, roof, rear wall, door, and just one extra side wall, the 3. (existing) side wall of the previous locker serves as the other side wall of the new locker. The walls, floors, and roofs of lockers may be 4. (either) riveted together (or) welded together.
Locker doors usually have some kind of ventilation to provide for the flow of air to aid in cleanliness. 5. (These) vents usually 6. (take ) the form of a series of horizontal angled slats at the top and bottom of a locker's door, 7. (although) sometimes parallel rows 8. (of ) small square or 9. (rectangular) holes are found instead, running up and down the door. Less often, the side or rear walls may also have similar 10. (ventilation).