Awenta PRO AVIRA 405 heat recovery unit in the foreground

Photo: Mariusz Młynarczyk / CloudAir.tech

A grey Awenta PRO heat recovery unit labelled "AVIRA 405" fills the foreground, mounted at an angle with its filter slot visible. Behind it the stand shows ventilation grilles, revision panels, recuperation system fittings and bathroom fans, with the backlit Awenta counter at right.