Editing Ventilation (architecture) (section)

=== Standards for residential buildings ===
For residential buildings, which mostly rely on [[Infiltration (HVAC)|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 house to 1.11 to 1.47 in a loosely air-sealed house.<ref>Kavanaugh, Steve. Infiltration and Ventilation In Residential Structures. February 2004</ref>

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).<ref>{{cite web|title=ASHRAE's First Residential Ventilation Standard|url=http://epb.lbl.gov/Publications/lbnl-54331.pdf|publisher=[[Lawrence Berkeley National Laboratory]]|author=M.H. Sherman|archive-url=https://web.archive.org/web/20120229082915/http://epb.lbl.gov/Publications/lbnl-54331.pdf|archive-date=February 29, 2012}}</ref>