Final report : the Canadian residential duct and chimney survey / submitted by Sheltair Scientific Ltd. : NH18-1/401-1989E-PDF

"The installed flow and thermal performance of ducts and chimneys in housing is not well known. However, recent field surveys funded by the Canada Mortgage and Housing Corporation (CMHC) have revealed that many fans, furnaces, and fireplaces are not working as intended. Fans have exhibited poor air flow. Combustion appliances are susceptible to pressure-induced spillage, or to draft problems caused by poor design and maintenance of the venting systems. Also, site-built systems, such as furnace ducting or masonry chimneys, differ widely from the theoretical designs that are used to determine appliance specifications. Often there has been no attention given to system design or to commissioning of new venting and ventilation systems in Canadian houses. This report describes the results of a project funded by CMHC, with the intent of achieving a better understanding of the nature and extent of such problems. The project commenced in September, 1988. The overall objective was to provide research organizations and policy groups with a detailed and accurate description of the current condition of ventilation systems, ducts and chimneys, in all types of Canadian houses, from coast to coast"--Intro., p. 1.

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