Historical
DIN EN 308:1997
Heat exchangers - Test procedures for establishing performance of air to air and flue gases heat recovery devices
This document specifies methods to be used for laboratory testing of air-to-air heat recovery devices. It gives test requirements and procedures for performing such tests and specifies input criteria required for tests to verify performance data given by the manufacturer. It also applies to heat recovery that are powered by exhaust air.
Deutsches Institut für Normung [din]