Abstract: Air-air heat exchanger (1) intended to be fitted to a room double-flow ventilation system comprising a plurality of plates (2) that are superposed to form a stack (3), each plate (2) comprising a plurality of flow channels forming a first air circulation volume (5) for a first air flow. The heat exchanger (1) further comprises spacer means designed to keep the plates (2) a distance apart so as to delimit a space (10) between two adjacent plates (2), these various spaces (10) between plates (2) forming an air circulation volume for a second air flow, first means for closing off the spaces (10) between the plates (2) at the two ends (6, 7) of the exchanger, second closing-off means (13), these second closing-off means (13) comprising, near the ends of the exchanger, two openings (20, 21), one for letting the second air flow in and the other for letting it out.

Abstract: A ventilation unit is provided comprising an electronically driven ventilator, mounted inside a casing wherein emerge several ducts connected to one or several rooms. Said unit further comprises orifices with specific cross-section, and a differential-pressure sensor measuring the difference in pressure between two predetermined points, said value being transmitted to an analysis and control device, which compares the differential pressure value to a reference value and controls the ventilator, such that it accelerates or slows down it rotational speed, so as to maintain the differential pressure constant and equal to the reference value, to maintain the desired flow rate at said orifices.

Abstract: The invention concerns a ventilation unit comprising an electrically driven ventilator (3), mounted inside a plenum chamber (2) wherein emerge several ducts (7) connected to one or several rooms. Said unit further comprises orifices with specific cross-section (21, 22, 23), and a differential pressure sensor (9) measuring the difference in pressure between two predetermined points, said value being transmitted to an analyzing and control device (10), which compares the differential pressure value to a reference value and controls the ventilator (3), such that it accelerates or slows down it rotational speed, so as to maintain the differential pressure constant and equal to the reference value, to maintain the desired flow rate at said orifices.