28 Feb '14, 9am

Exhaust-Only Ventilation Systems and Radon

Articles on mechanical ventilation commonly warn builders that exhaust-only ventilation Mechanical ventilation system in which one or more fans are used to exhaust air from a house and make-up air is supplied passively. Exhaust-only ventilation creates slight depressurization of the home; its impact on vented gas appliances should be considered. systems can pull radon Colorless, odorless, short-lived radioactive gas that can seep into homes and result in lung cancer risk. Radon and its decay products emit cancer-causing alpha, beta, and gamma particles. into a house through foundation cracks. The warning makes intuitive sense: after all, an exhaust-only ventilation system works by depressurizing a house with respect to the outdoors, and it seems obvious that depressurization Situation that occurs within a house when the indoor air pressure is lower than that outdoors. Exha...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/ex...

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