Mechanical Ventilation System Options

There are essentially two mechanical ventilation system options for housing. The first option consists of a number of alternatives which are prescribed in the National Building Code. The second option involves competent mechanical design and installation in accordance with the requirements of CAN/CSA-F326, Residential Mechanical Ventilation Systems. The discussion which follows focuses on the prescribed alternatives noted in the National Building Code. Further information may be obtained from the reference publications listed at the end of this chapter.

Stand-alone ventilation systems, also referred to as ventilation systems not coupled to a forced-air heating system, consist of fans, ducts, grilles and controls which exhaust air from selected rooms in the house, and supply air to rooms which are not being exhausted. These systems have the advantage of being designed especially for ventilation only, independent of the need to deliver heating or cooling. Tempering incoming outdoor air is required to maintain a • comfortable air supply temperature. Stand-alone ventilation systems are typically installed in houses with heating systems which do not rely on forced-air distribution of heat.

Ventilation systems coupled to a forced-air heating system are similar to stand-alone ventilation systems, but share ductwork with the heating system for the supply of fresh air to heated rooms. It is necessary to interlock ventilation system and heating system controls, so that the furnace

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