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  2. No, You Don't Need to Clean Your Air Ducts Every Year ... - AOL

    www.aol.com/no-dont-clean-air-ducts-110500245.html

    Diving into the world of air duct cleaning can turn risky if you don't do your due diligence when searching for a reputable company or technician. Some cleaning companies might try to talk you ...

  3. Is your heater making you sick? How to avoid cold-like ...

    www.aol.com/lifestyle/heater-making-sick-avoid...

    The dry air produced by heating systems can irritate your nasal passages and throat, which can in turn cause discomfort, Lizarzaburu adds. Dry air can also make it harder to fight off colds.

  4. Heating, ventilation, and air conditioning - Wikipedia

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

    Air handling unit, used for heating, cooling, and filtering the air. Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments ...

  5. 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

  6. Duct (flow) - Wikipedia

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

    Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

  7. Forced-air - Wikipedia

    en.wikipedia.org/wiki/Forced-air

    A forced-air central heating system is one which uses air as its heat transfer medium. These systems rely on ductwork, vents, and plenums as means of air distribution, separate from the actual heating and air conditioning systems. The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating ...

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