%0 Conference Paper
%A Haoran Zhao
%A Wanyu R Chan
%A Chrissi Antonopoulos
%A Eric Martin
%A Paul Francisco
%A Iain S Walker
%A Brett C Singer
%B Indoor Air 2024
%D 2024
%G eng
%T Mechanical Ventilation and IAQ in Recently Constructed US Homes
%8 04/2024
%X <p>Data were collected to characterize whole-house mechanical ventilation (WHMV) and indoor<br />air quality (IAQ) in 139 homes across four US regions, including 29 in the Marine climate of<br />Oregon, 26 in Cold-Dry Colorado, 32 in Mixed-Humid Illinois, and 52 in the Hot-Humid<br />Southeast. Thirty-six homes were monitored with and without WHMV operating. All homes<br />had operational cooktop ventilation and bathroom exhaust. Envelope and duct airtightness;<br />mechanical ventilation airflows; time-resolved CO2, PM2.5 formaldehyde and radon; and time-<br />integrated NO2, NOx and formaldehyde were measured. Participants provided information<br />about IAQ-impacting activities, perceptions and ventilation use. Preliminary results indicate<br />that the installed WHMV often did not meet requirements of ASHRAE 62.2-2010; WHMV<br />was operating in only half of the homes as found and 22% had WHMV airflow at or above the<br />requirement, as found. Homes with WHMV had significantly lower CO2 and radon<br />concentrations compared to those without WHMV running</p>