This Standard provides homeowners, contractors, equipment manufacturers and others involved in Canadian residential buildings with information which describes a method to identify when residential depressurization may cause a health risk, and provides solutions to prevent or mitigate the buildup of combustion products in the house. This Standard is intended for the use of those who sell and install fuel burning appliances and ventilation equipment, as well as designers, renovators, trades people, building officials, utilities, and homeowners.