Recessed vertical wall‐mounted mechanical ventilation unit consisting of a galvanized steel plate embedded box with holes for electrical and air connections, fan unit, and front panel in galvanized steel plate painted RAL 9010. The fan unit is made up of a pre‐painted steel plate frame and internal thermo‐acoustic insulation in rock wool. WHRI 152 is equipped with high efficiency polypropylene heat exchanger (~90%), F7 filters (ISO ePM1 60%) on the supply and exhaust lines, by‐pass for free‐cooling and NTC sensors. Antifreeze function and dirty filter detection included. The unit can be managed using a dedicated control panel with simple display (WHRI 152 3E ventilation unit), or a white LCD (WHRI 152 EB ventilation unit).