"Understanding Your Home" by Building Inspector Mark Visser
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Heat recovery ventilator

Whole house ventilation
is relatively inexpensive. Adding motorized damper controls or an independent central exhaust and supply system for kitchen and bathrooms in existing homes could be expensive.



Whole House Ventilation and HRV's
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HRV's. Whole house ventilation.

Humidity levels are influenced by the amount of moisture produced in the home and the rate at which it escapes to the exterior. Moisture is produced by activities such as cleaning, washing, clothes drying, cooking and bathing. A family of four can 'produce' as much as five gallons (23 liters) of water into the air every day.
Increasing ventilation is an effective way to control moisture problems but care should be taken. Too much ventilation will inflate your fuel costs. Too little ventilation will not solve your humidity problems.

Whole house ventilation
. An effective way for houses with forced air heating systems to be ventilated is to install an air duct that brings outside air into the return air system. This insulated duct should have a damper to control the amount of air being drawn in. Ideally, air is drawn from moisture producing areas such as bathrooms and kitchens, while fresh air is evenly distributed throughout the house.

Heat recovery Ventilators (HRV)
. HRV's are also known as air-to-air heat exchangers. They can be used to warm up the intake air in the winter and to cool it down in the summer. Each HRV consists of two fans, a heat exchanger, controls and filters.
They are cost-effective only in air tight homes and the ventilation is run more or less continuously. HRV's are often installed in homes that contain urea formaldehyde foam insulation (UFFI).

Whole house ventilation

Heat recovery ventilator

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