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2. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments.

3. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   Process duct work may be round or rectangular. Although round duct work costs more to fabricate than rectangular duct work, it requires fewer stiffeners and is favored in many applications over rectangular ductwork. The air in process duct work may be at ambient conditions or may operate at up to 900 °F (482 °C).

4. Electrical conduit - Wikipedia

   en.wikipedia.org/wiki/Electrical_conduit

   The conduit may be coated to prevent corrosion by incidental contact with concrete. Aluminum conduit is generally lower cost than steel in addition to having a lower labor cost to install, since a length of aluminum conduit will have about one-third the weight of an equally-sized rigid steel conduit. [2]

5. Duct (flow) - Wikipedia

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

   Galvanized mild steel is the standard and most common material used in fabricating ductwork because the zinc coating of this metal prevents rusting and avoids cost of painting. For insulation purposes, metal ducts are typically lined with faced fiberglass blankets (duct liner) or wrapped externally with fiberglass blankets (duct wrap).

6. US economy adds 227,000 jobs in November, unemployment ... - AOL

   www.aol.com/finance/november-jobs-report...

   Wage growth, an important measure for gauging inflation pressures, rose 0.4% in November, in line with October's increase and higher than the 0.3% rise economists had expected.

7. Trump tariffs on Canada imports could bring sharply higher ...

   www.aol.com/trump-tariffs-canada-imports-could...

   Donald Trump's proposed tariffs on Canada could increase U.S. gas prices by up to 70 cents a gallon, energy experts say.

8. State and local governments could be a roadblock for some of ...

   www.aol.com/state-local-governments-could...

   PHOTO: In this Sept. 6, 2024, file photo, Republican presidential nominee and former President Donald Trump looks on during a press conference at Trump Tower in New York.

9. Air handler - Wikipedia

   en.wikipedia.org/wiki/Air_handler

   The blowers in an air handler can create substantial vibration and the large area of the duct system would transmit this noise and vibration to the occupants of the building. To avoid this, vibration isolators (flexible sections) are normally inserted into the duct immediately before and after the air handler and often also between the fan ...