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2. How Often Should You Clean Your Air Ducts? Experts Explain - AOL

   www.aol.com/often-clean-air-ducts-experts...

   How much does duct cleaning cost? Air duct cleaning costs are determined by a variety of factors, including accessibility, vent locations, area of the home, and the size. The costs can range from ...

3. Duct (flow) - Wikipedia

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

   In the UK, CIBSE standard TM26 recommends duct cleaning if measured bacterial content is more than 29 colony forming units (CFU) per 10 cm 2; contamination is classified as "low" below 10 CFU/cm 2, "medium" at up to 20 CFU/cm 2, and "high" when measured above 20 CFU/cm 2.

4. Heating, ventilation, and air conditioning - Wikipedia

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

   The first residential AC was installed by 1914, and by the 1950s there was "widespread adoption of residential AC". [ 13 ] The invention of the components of HVAC systems went hand-in-hand with the Industrial Revolution , and new methods of modernization, higher efficiency, and system control are constantly being introduced by companies and ...

5. List of cleaning companies - Wikipedia

   en.wikipedia.org/wiki/List_of_cleaning_companies

   Jani-King – an American chain and franchise of cleaning services. [4] Merry Maids – a residential cleaning service franchisor founded in 1979, acquired by ServiceMaster in 1988, with franchises in the United States, Canada and the United Kingdom. [5] Molly Maid – an internationally franchised domestic cleaning company. [6] [7]

6. 20 Ways to Lower Your Electric Bill This Winter

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   That means it is a good time to figure out how to lower heating costs so you can stay warm without breaking the bank. ... Invest in a One-Time Duct Cleaning. ... and a one-time vent cleaning will ...

7. Turning vanes (HVAC) - Wikipedia

   en.wikipedia.org/wiki/Turning_vanes_(HVAC)

   HVAC turning vanes are sheet metal devices inside of mechanical ductwork used to smoothly direct air inside a duct where there is a change in direction, by reducing resistance and turbulence. See also