Of course, it is problematic to install a full-fledged centralized supply and exhaust ventilation system when house renovation is complete, since the installation of the air ducts will require repair work.A decentralized ventilation system based on Meltem, Zehnder, Maico, Mitsubishi Electric, Soler & Palau units is an optimal solution when the renovation work is complete, but creating a healthy microclimate with air recuperation in the apartment is necessary. Heat recuperation ventilation system with a Maico – PushPull deviceThe supply and exhaust devices with Maico - PushPull heat recuperator with exhaust fans for the bathroom (usually installed in the kitchen and bathroom) - are an optimal solution when renovation work is complete but creating a healthy microclimate with air recuperation is necessary. As a standard, these devices operate in pairs (two units are located in adjacent rooms): one of them is for air supply, and the second is for air discharge, after a certain time they swap functionality. When the exhaust fan starts working in the bathroom or the kitchen, the air handling units begin to operate on the inflow method, compensating for the reclaimed air volume. Air movement around the apartment is performed using a non-threshold system.Each unit is wall-mounted and has a maximum capacity of 45 m3/h, which is optimal for two people staying in the room. The built-in heat recuperator with an efficiency of 84% allows to create an optimal air exchange process and save costs on additional heating of the rooms.