During the winter, ACH may range from 0.50 to 0.41 in a tightly air-sealed house to 1.11 to 1.47 in a loosely air-sealed house.(a) True(b) FalseI got this question in my homework.I need to ask this question from Orientation of Building and House Planning in division Planning of Building and Colony of Civil Engineering Drawing

During the winter, ACH may range from 0.50 to 0.41 in a tightly air-se

1.	During the winter, ACH may range from 0.50 to 0.41 in a tightly air-sealed house to 1.11 to 1.47 in a loosely air-sealed house.(a) True(b) FalseI got this question in my homework.I need to ask this question from Orientation of Building and House Planning in division Planning of Building and Colony of Civil Engineering Drawing
Answer» CORRECT choice is (a) True Explanation: 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). ASHRAE now recommends ventilation rates dependent upon FLOOR area, as a revision to the 62-2001 standard, in which the minimum ACH was 0.35, but no less than 15 CFM/person (7.1 L/s/person). As of 2003, the standard has been changed to 3 CFM/100 sq. ft. (15 l/s/100 sq. m.) plus 7.5 CFM/person (3.5 L/s/person).

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