CSA F326:23

1 Scope 1.1 Inclusions This Standard defines the requirements for performance, installation and application, and performance verification of mechanical ventilation systems. This Standard applies to systems that are capable of providing minimum controlled rates of outdoor air to the habitable spaces of those single-family dwelling units that a) fall within the Scope of Part 9 of the National Building Code of Canada; and b) are self-contained with respect to heating, ventilation, and air conditioning. This Standard also applies to dwelling units that fall outside the scope of Part 9 of the NBC as long as the low flow and high flow rates are provided by a balanced system where the supply and exhaust airflows are within 10% of each other and are self-contained with respect to heating, ventilation, and air conditioning. This Standard also applies to the installation requirements for ventilation components such as supply and exhaust ventilation fans and associated equipment, including bathroom exhaust fans, kitchen exhaust fans, cooktop hoods with or without ducts, and downdraft exhaust fans intended for operation in the dwelling unit, whether or not a part of a ventilation system conforming to this Standard. This Standard also applies to the installation requirements for self-contained ducted heat or enthalpy recovery ventilators intended for operation in the dwelling unit, whether or not they constitute a part of a ventilation system conforming to this Standard. The applicable heat or enthalpy recovery ventilators have a maximum rated capacity of not more than 236 L/s (500 cfm). The amounts of ventilation and exhaust air specified in this Standard are intended to deal with contaminants at the rates of generation normally encountered in residential dwellings. Acceptable indoor air quality also requires that the rate of contaminant generation be controlled.