A Canadian standard for residential ventilation systems.

Increasing air-tightness of houses in Canada in recent years, and related concern over indoor air quality and excessive humidity in winter, has led to provisions in the National Building code of Canada for mechanical ventilation systems in all new selfcontained
dwelling units. This paper describes the development of national consensus standards to provide detailed guidance on design, installation and performance verification of such systems. The need to account for their interaction with, and impact on other components and systems is stressed. This includes the effect of house pressurization on condensation in the building envelope, and the effect of depressurization on the venting of fuel-fired combustion equipment.