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2. Air door - Wikipedia

   en.wikipedia.org/wiki/Air_door

   An air door or air curtain is a device used to prevent air, contaminants, or flying insects from moving from one open space to another. The most common implementation is a downward-facing blower fan mounted over an entrance to a building, or over an opening between two spaces conditioned at different temperatures.

3. Stack effect - Wikipedia

   en.wikipedia.org/wiki/Stack_effect

   Since buildings are not totally sealed (at the very minimum, there is always a ground level entrance), the stack effect will cause air infiltration. During the heating season, the warmer indoor air rises up through the building and escapes at the top either through open windows, ventilation openings, or unintentional holes in ceilings, like ...

4. Building envelope - Wikipedia

   en.wikipedia.org/wiki/Building_envelope

   A blower door test can be used to test the quality of the air sealing of the building envelope. Smoke pencils can be used to detect gaps and caulking and weather-stripping can be used to improve air sealing. [10] HVAC systems can ensure that a building’s air intake is both adequate, safe, and energy efficient.

5. Air curtain - Wikipedia

   en.wikipedia.org/wiki/Air_curtain

   Air curtain may refer to: Air door, a fan-powered device used for separating two spaces from each other; Pneumatic barrier for containing oil spills; See also

6. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   A central heating system has a furnace that converts fuel or electricity to heat. The heat is circulated through the building either by fans forcing heated air through ducts, circulation of low-pressure steam to radiators in each heated room, or pumps that circulate hot water through room radiators.

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   mail.aol.com

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