Building Codes Assistance Project

Issue: The air within homes can become polluted from moisture, odors, and other contaminants that penetrate the residence or are generated internally by human activity and out gassing from building materials and furnishings. A steady supply of fresh outdoor air can increase indoor air quality and improve occupant comfort. Historically, residential buildings have not had specific requirements for ventilation because leakage in envelope components and natural ventilation was considered adequate. As envelope construction practice has improved and buildings have become more airtight, the need to control air quality in the home has risen.

Options: More stringent requirements for ventilation fans, pollution or moisture-based source-point ventilation, and whole-house ventilation systems; Requirement for automatic controls or systems capable of being set remotely for continuous operation

Click here for more information on Mechanical Ventilation.