The GAP-type heat recuperators are at the cutting edge of small-size waste heat boiler technology. Thanks to the combination of performance, reliability and compactness, the GAP-type heat recuperators make waste heat recovery within reach of all industrial processes. The GAP 30-3-2 waste heat recuperator has been designed to answer heat recovery needs for applications that require highly effective exchange within a small volume and that involve clean or slighty dusty fumes. The GAP 30-3-2 has been specially designed to fit within DN300 (12) chimney ducts.