For installing a stand-alone, continuous whole-house ventilation system, the International Residential Code (IRC) - 2012/2015/2018 follows an early version of ASHRAE Standard 62.2, resulting in a lower air-flow rate.

It offers two methods to determine the required airflow in cubic feet per minute (cfm). Note that the IRC does allow whole-house ventilation systems to operate intermittently according to rate factors defined in Table M1507.3.3(2), but if you are following the arguments put forward in the main article, continuous ventilation offers the best performance for both the building and the health of the occupants.

Formula. The required flow rate for whole-building ventilation can be calculated as follows:

Ventilation rate in cfm = [floor area / 100] + [(number of bedrooms + 1) x 7.5]

Prescriptive table. Another way to determine the baseline airflow rate is to use the prescriptive table (below).

Table M1507.3.3(1) of the IRC 2015 and 2018 (a.k.a. M1507.3.3(1) in the 2012 IRC; the requirements have not changed, only the table reference) can be found in IRC Chapter 15-Exhaust Systems of the International Residential Code.
Table M1507.3.3(1) of the IRC 2015 and 2018 (a.k.a. M1507.3.3(1) in the 2012 IRC; the requirements have not changed, only the table reference) can be found in IRC Chapter 15-Exhaust Systems of the International Residential Code.

Keep in mind each of these methods specify a minimum air-flow rate for houses. More is always better for occupancy health, and Mark Laliberte would prefer to see the higher air flow specified in ASHRAE 62.2-2013/2016/2019, which calls for .03 cfm per sq. ft. of floor area (up from 0.01 cfm/sq. ft. shown here), as a starting point. A true health-based standard, which accounts more for occupancy than for house size, goes even higher, particularly in smaller houses, where even the higher rates of ASHRAE 62.2-2013 fail to deliver sufficient air flow on a per person basis.