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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. Valley Furnace, West Virginia - Wikipedia

   en.wikipedia.org/wiki/Valley_Furnace,_West_Virginia

   Valley Furnace is an unincorporated community in Barbour County, West Virginia, United States. The community was named for a blast furnace near the original town site. [ 2 ]

4. List of preserved historic blast furnaces - Wikipedia

   en.wikipedia.org/wiki/List_of_preserved_historic...

   Blast furnace 3, including the cast house, is one of the main components of the museum and features numerous information plates, exhibition pieces and documentary films on monitors. The blast furnace also serves as an observation platform. An elevator has been installed. A colorful light installation illuminates the blast furnace at night.

5. Rockhill, Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Rockhill,_Pennsylvania

   Rockhill or Rockhill Furnace is a borough in Huntingdon County, Pennsylvania, United States. [2] The population was 371 at the 2010 census , [ 4 ] down from 414 at the 2000 census . It is the site of the East Broad Top Railroad and the Rockhill Trolley Museum .

6. Franklin Furnace Historic District - Wikipedia

   en.wikipedia.org/wiki/Franklin_Furnace_Historic...

   The district includes five contributing buildings, one contributing structure, and one contributing site associated with a 19th-century iron furnace plantation. The buildings are the manager's house/office and four workers' houses. The structure is the furnace stack (1828). It measures 30 feet square at the base and approximately 30 feet tall.

7. Hopewell Furnace National Historic Site - Wikipedia

   en.wikipedia.org/wiki/Hopewell_Furnace_National...

   Hopewell Furnace stove, 10-plate cooking model, with a lower firebox and upper oven for baking. Hopewell Furnace National Historic Site in southeastern Berks County, near Elverson, Pennsylvania, is an example of an American 19th century rural iron plantation, whose operations were based around a charcoal-fired cold-blast iron blast furnace.