The Zehnder ComfoAir 180 is a heat recovery unit designed to enable better and easier specification of ventilation in new or refurbishment properties due to its compact size and unique ductwork. It can be left or right handed in addition to being small enough to mount in a kitchen cupboard. It contains features such as its automatic true summer by-pass, high heat recovery efficiency and upgradable high grade filters providing a comfortable, healthy and energy-efficient indoor climate.