ERV/HRV are actually part of regular building codes in many areas. The province of Ontario:
* https://www.greenbuildingadvisor.com/article/ontario-imposes...
* https://airfixture.com/blog/ontario-building-code-ventilatio...
* http://www.mah.gov.on.ca/AssetFactory.aspx?did=15947
* https://web.archive.org/web/20180626073728/http://www.mah.go...