NBN EN 308 : 1997

Introduction
1 Scope
2 Normative references
3 Symbols and subscripts
4 Definitions
    4.1 Heat recovery device
    4.2 Mass flows
    4.3 Ratios
    4.4 External leakage
    4.5 Internal leakage
    4.6 Internal exhaust air leakage
    4.7 Carry-over air flow
    4.8 Reference conditions
    4.9 Pressure
5 General requirements
    5.1 Heat recovery device
    5.2 External leakage
    5.3 Internal exhaust air leakage
    5.4 Carry-over
    5.5 Temperature and humidity ratios
    5.6 Pressure drop
6 Test procedures and accuracy requirements
    6.1 External leakage test
    6.2 Internal exhaust leakage test (categories 1 and IIa)
    6.3 Carry-over test (category III)
    6.4 Ratio tests (see figure 3)
    6.5 Pressure drop tests (see figure 3)
    6.6 Heat balance
7 Test report
    7.1 Heat recovery device
    7.2 External leakage
    7.3 Internal exhaust air leakage
    7.4 Carry-over
    7.5 Temperature and humidity ratios
    7.6 Pressure drop: for standard air
    7.7 Other indications