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2. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   In open places where the fan may come in contact with water, one must use wet-rated fans. UL Wet-rated fans have a completely sealed motor which can withstand direct exposure to rainwater, snow and can even be washed off with a garden hose. Both industrial and residential fans come in dry-rated as well as damp and wet-rated varieties. [15]

3. Metal-halide lamp - Wikipedia

   en.wikipedia.org/wiki/Metal-halide_lamp

   Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]

4. Lamplighter - Wikipedia

   en.wikipedia.org/wiki/Lamplighter

   The largest gas lighting network in the world is that of Berlin, Germany. With about 37,000 lamps (2014), [10] it holds more than half of all working gas street lamps in the world. In central London around 1500 gas lamps still operate, lighting the Royal Parks, the exterior of Buckingham Palace and almost the entire Covent Garden area.

5. Underfloor heating - Wikipedia

   en.wikipedia.org/wiki/Underfloor_heating

   Underfloor heating pipes, before they are covered by the screed. Underfloor heating and cooling is a form of central heating and cooling that achieves indoor climate control for thermal comfort using hydronic or electrical heating elements embedded in a floor.