September 15, 2008
Mixed-Humid Hot-Humid


Concentrations of 54 volatile organic compounds (VOCs) and ventilation rates were measured in four new manufactured houses over 2-to-9.5 months following installation and in seven new site-built houses 1-to-2 months after completion. The houses were in four projects located in hot-humid and mixed-humid climates. They were finished and operational, but unoccupied. Several of the site-built houses had ventilation rates below the ASHRAE recommended value. Generally, the ratios of emission rates at the low and high ventilation rates decreased with decreasing compound volatility. Changes in VOC emission rates in the manufactured houses varied by compound. Only several compounds showed a consistent decrease in emission rate over this period.