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  2. Building airtightness - Wikipedia

    en.wikipedia.org/wiki/Building_airtightness

    The airtightness of a building is often expressed in terms of the leakage airflow rate through the building's envelope at a given reference pressure (usually 50 pascal) [10] divided by the: Heated building volume V. At 50·Pa, it is called the air change rate at 50 Pa and usually noted n 50 (units: h −1). [13] [14] Envelope area A E.

  3. Ventilation (architecture) - Wikipedia

    en.wikipedia.org/wiki/Ventilation_(architecture)

    For residential buildings, which mostly rely on infiltration for meeting their ventilation needs, a common ventilation rate measure is the air change rate (or air changes per hour): the hourly ventilation rate divided by the volume of the space (I or ACH; units of 1/h). During the winter, ACH may range from 0.50 to 0.41 in a tightly air-sealed ...

  4. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each hour.

  5. Atkinson resistance - Wikipedia

    en.wikipedia.org/wiki/Atkinson_resistance

    One gaul is defined as the resistance of an airway which, when air (of density 1.2 kg/m 3) flows along it at a rate of one cubic metre per second, causes a pressure drop of one pascal. The gaul has units of N·s 2 /m 8, or alternatively Pa·s 2 /m 6. It uses the same basic equation as its Imperial counterpart, but with slightly different ...

  6. Stack effect - Wikipedia

    en.wikipedia.org/wiki/Stack_effect

    There is a pressure difference between the outside air and the air inside the building caused by the difference in temperature between the outside air and the inside air. That pressure difference ( ΔP ) is the driving force for the stack effect and it can be calculated with the equations presented below.

  7. Jets eliminated from playoff contention, extending NFL-worst ...

    www.aol.com/jets-eliminated-playoff-contention...

    The New York Jets' trying season has hit a new low – yet one long familiar to the franchise.. With Sunday's 32-26 overtime loss to the Miami Dolphins, the Jets (3-10) were officially eliminated ...

  8. Trump's federal prosecution ends as appeals court drops him ...

    www.aol.com/jack-smith-defends-appointment...

    One day after special counsel Jack Smith moved to dismiss both his cases against President-elect Donald Trump, the U.S. Court of Appeals for the Eleventh Circuit complied by dropping Trump from ...

  9. Actual cubic feet per minute - Wikipedia

    en.wikipedia.org/wiki/Actual_cubic_feet_per_minute

    Actual cubic feet per minute (ACFM) is a unit of volumetric flow. It is commonly used by manufacturers of blowers and compressors. [1] This is the actual gas delivery with reference to inlet conditions, whereas cubic foot per minute (CFM) is an unqualified term and should only be used in general and never accepted as a specific definition without explanation.

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