Whole-House VentilationOlder Homes: Traditional VentilationWithout a mechanical ventilation system, the amount of fresh air that enters a home is largely a matter of chance. "Natural ventilation" – the kind you get by opening windows – just doesn't do the best job, because it tends to provide either too much or too little ventilation. In older homes:
Newer Homes: Poorly Installed VentilationNew construction techniques and materials have led to homes that are more tightly built – making proper ventilation all the more critical. If ventilation systems are poorly installed or are being used improperly by the homeowners, the result can be excessively high indoor humidity levels, "stuffy house syndrome," and window condensation in colder weather. Depressurization – resulting from uncontrolled ventilation – is an even more serious potential problem. Often home heating systems, bathroom fans and kitchen exhaust fans all compete with the home's occupants for fresh air. If more air is exhausted than can leak into the house naturally, the resulting lowered pressure can cause toxic combustion gases to be released from unsealed heating and cooling systems into the house. R-2000 Homes: State-of-the-Art VentilationR-2000 homes avoid ventilation problems by combining tight, well-insulated, leak-free construction with an energy-efficient mechanical heat recovery ventilation (HRV) system. The HRV system provides a continuous stream of fresh, filtered outdoor air to all living areas of the home. At the same time, it maintains a balance in the home's air by removing an equivalent amount of stale air from the kitchen and bathrooms, where humidity and odours occur. The ventilation system installed in an R-2000 home typically has the capacity to change all the air in the house every three hours. In addition, the system includes a heat recovery device that uses heat captured from the exhaust air to pre-heat incoming fresh air. This makes ventilation much more cost-effective. Typically, an HRV system recovers 70 to 80 percent of the heat in exhaust air, ensuring that homeowners have fresh air and low energy bills. R-2000 homes also come with combustion-based heating systems designed to prevent the spillage of toxic gases. This offsets any potential hazards from inadvertent depressurization. Heat Recovery Ventilator (HRV) (not connected to a forced-air heating system)Here are the specifications for a properly installed HRV system:
R-2000 is an official mark of Natural Resources Canada. |
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