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2. Heat recovery ventilation - Wikipedia

   en.wikipedia.org/wiki/Heat_recovery_ventilation

   Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...

3. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.

4. Ventilation shaft - Wikipedia

   en.wikipedia.org/wiki/Ventilation_shaft

   Chipping Sodbury Tunnel ventilation shaft Swan St. ventilation shaft on the Burnley Tunnel Ventilation shafts of the Velser tunnel, the Netherlands. In subterranean civil engineering, ventilation shafts, also known as airshafts or vent shafts, are vertical passages used in mines and tunnels to move fresh air underground, and to remove stale air.

5. Library of Alexandria - Wikipedia

   en.wikipedia.org/wiki/Library_of_Alexandria

   [84] [85] [61] [8] This fire purportedly spread to the parts of the city nearest to the docks, causing considerable devastation. [ 85 ] [ 82 ] [ 8 ] The first-century AD Roman playwright and Stoic philosopher Seneca the Younger quotes Livy 's Ab Urbe Condita Libri , which was written between 63 and 14 BC, as saying that the fire started by ...