The most common mistake with the systems of the Heat Recovery Ventilation is not to make them function on a regular basis.

A common belief is to think that it is useful only for the exchange of air due to the presence of people; but on the contrary it is essential to guarantee a constant air exchange for the correct conservation of the structure.
Another mistake is neglecting maintenance: it is important to keep the system efficient, therefore periodically clean and replace the filters, and etc.