Under-balancing mechanical supply and exhaust ventilation systems with heat recovery – effects on energy use

Dennis Johansson & Dennis Johansson
Mechanical supply and exhaust ventilation with heat recovery is usually slightly under-balanced. That means that the supply air flow rate is lower than the exhaust air flow rate. That is made in cold climates to prevent moist air from infiltrating the building construction parts. Usually, the exhaust air is more polluted so the exhaust filter pressure rises quicker than the supply filter pressure. The under-balanced ventilation therefore gives a margin to avoid over-pressure with time....
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