Defro Air heat recovery units with open panels under a hanging cube

Photo: Mariusz Młynarczyk / CloudAir.tech

Several Defro heat recovery units stand on wooden pallets with side panels removed to show exchangers and filters marked "M5". A cube suspended above reads "DEFRO air – Polskie Centrale Wentylacyjne", and the dark grey stand behind combines the Defro logo, the "HYBRYDOWE SYSTEMY GRZEWCZE" wall and a yellow armchair.