The KAISAI recuperation units are highly efficient ventilation systems with a heat recovery function, designed for mechanical ventilation of houses, apartments, offices and shops. During their operation, they exchange the exhaust air from the interior with the air drawn from the outside, purified by means of a special high-performance class F7 filter. The counter-current heat recovery exchanger prevents heat loss during the winter, recovering up to 92.5% of the energy. In addition, filters installed in the unit clean the air from viruses, pollutants, allergens, and smog, while fully flexible installation and intuitive control ensure high comfort of use of the unit.