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Aerefy Academy

Become an expert in indoor air quality and ventilation
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Ventilation myths #6/8
Ivo Remmelg
Ventilation myths #6/8
If the ventilation unit is undersized, the entire system must be replaced. Is the CO₂ level too high in your bedroom and you sleep all winter with the window open? Do you open the windows when guests ...
Apr 15, 2026
Ventilation myths #7/8
Ivo Remmelg
Ventilation myths #7/8
Positive pressure vs. negative pressure I have heard contradictory claims from ventilation specialists and building owners alike. Sometimes positive pressure is recommended so that “cold air doesn’t e...
Apr 15, 2026
Ventilation Myths #8/8
Ivo Remmelg
Ventilation Myths #8/8
Supply air temperature must be equal to room temperature. It cannot be said that designers are doing ventilation wrong — but in many buildings, solutions could definitely be significantly better. Toda...
Apr 15, 2026
Demand-based or static?
Ivo Remmelg
Demand-based or static?
Water from the tap, indoor temperature, heating, your car, even food in a restaurant—everything we consume is demand-based. It would be hard to imagine building a house, installing the plumbing, and t...
Apr 15, 2026
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