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2. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   A duct with less than 0.75 mg/100m 2 is considered to be clean, per the NADCA standard. [7] A Hong Kong standard lists surface deposit limits of 1g/m 2 for supply and return ducts and 6g/m 2 for exhaust ducts, or a maximum deposit thickness of 60 μm in supply and return ducts, and 180 μm for exhaust ducts. [8]

3. District heating - Wikipedia

   en.wikipedia.org/wiki/District_heating

   The Spittelau incineration plant is one of several plants that provide district heating in Vienna, Austria. Animated image showing how district heating works. District heating (also known as heat networks) is a system for distributing heat generated in a centralized location through a system of insulated pipes for residential and commercial heating requirements such as space heating and water ...

4. Solar thermal collector - Wikipedia

   en.wikipedia.org/wiki/Solar_thermal_collector

   This heated air is then ducted to the building space or to the process area where the heated air is used for space heating or process heating needs. Functioning in a similar manner as a conventional forced-air furnace, solar-thermal-air systems provide heat by circulating air over an energy collecting surface, absorbing the sun's thermal energy ...

5. System Mechanic Software | 30-Day Free* Trial | AOL Products

   www.aol.com/products/utilities/system-mechanic

   Download System Mechanic to help repair and speed up your slow PC. Try it free* for 30 days now.

6. Timeline of United States inventions (before 1890) - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_United_States...

   District heating distributes heat generated in a centralized location for residential and commercial heating requirements. The heat is often obtained from a cogeneration plant burning fossil fuels but increasingly biomass, although heat-only boiler stations, geothermal heating and central solar heating are also used, as well as nuclear power.

7. Philadelphia - Wikipedia

   en.wikipedia.org/wiki/Philadelphia

   The city encompasses 142.71 square miles (369.62 km 2), of which 134.18 square miles (347.52 km 2) is land and 8.53 square miles (22.09 km 2), or 6%, is water. [79] Natural bodies of water include the Delaware and Schuylkill rivers, lakes in Franklin Delano Roosevelt Park , and Cobbs , Wissahickon , and Pennypack creeks.