Stiebel Eltron de-centralised heat recovery ventilators (HRV). They require a pair with 1 pushing stale air out and the other pulling fresh air in. Up to 4 pairs can be grouped together. For more than 1 pair, the 8CU controller is required (part 239572), which can manage up to 4 pairs. Note that prices are continually reviewed and may change prior to the new listing. Prices listed below include GST ex Melbourne warehouse. Contact us for pickup or delivery arrangements that may require added freight cost.