The standard applies to flexible aluminum drain pipes with a maximum length of 1 m and with nominal diameters of 50 to 200 mm. These are intended for the dis harge of combustion gases from gas consumption appliances that do not produce condensation water and form part of a vis ble dis harge pipe in an installation room. The combustion gases must have a temperature lower than 250 °C.
NEN 7204-1984 history
1984NEN 7204-1984 Installations for gas - Flexible aluminium pipes for gas vents