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2. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   A floor register. A register is a grille with moving parts, capable of being opened and closed and the air flow directed, which is part of a building's heating, ventilation, and air conditioning (HVAC) system. The placement and size of registers is critical to HVAC efficiency. Register dampers are also important, and can serve a safety function.

3. Floor drain - Wikipedia

   en.wikipedia.org/wiki/Floor_drain

   Floor drain system in bathroom, Korea. A floor drain is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. They are usually round, but can also be square or rectangular. They usually range from 2 to 12 inches (5.1 to 30.5 cm); most are 4 inches (10 cm) in diameter.

4. Architecture of Africa - Wikipedia

   en.wikipedia.org/wiki/Architecture_of_Africa

   [93] [94] The walls of Thimlich Ohinga also included vents for water drainage, buttresses to reinforce the free-standing walls and a watchtower.Within the walls of the settlement were livestock enclosures, houses and granaries. The inhabitants of Thimlich Ohinga engaged in craft industries, most notably pottery and metallurgy. Imported glass ...