scope:

This document gives guidelines to correct the measured air flow rate when measuring conditions are different from standard conditions. It applies to a power-law formula giving the air flow rate as a function of a pressure difference with an air flow rate coefficient, C, varying with temperature and pressure.

This document applies to:

- passive elements of air distribution systems with a cross-section area that does not depend on pressure;

- volume flow rate (and not mass flow rate).

This document is applicable to (but not limited to):

- EN 1507, Ventilation for buildings

- Sheet metal air ducts with rectangular section

- Requirements for strength and leakage;

- EN 1751, Ventilation for buildings

- Air terminal devices

- Aerodynamic testing of damper and valves;

- EN 12237, Ventilation for buildings

- Ductwork

- Strength and leakage of circular sheet metal ducts;

- EN 13141-1, Ventilation for buildings

- Performance testing of components/products for residential ventilation

- Part 1: Externally and internally mounted air transfer devices;

- EN 13141-2, Ventilation for buildings

- Performance testing of components/products for residential ventilation

- Part 2: Exhaust and supply air terminal devices;

- EN 13141-9, Ventilation for buildings

- Performance testing of components/products for residential ventilation

- Part 9: externally mounted humidity controlled air transfer device;

- EN 13141-10, Ventilation for buildings

- Performance testing of components/products for residential ventilation

- Part 10: humidity controlled extract air terminal device;

- EN 15727, Ventilation for buildings

- Ducts and ductwork components, leakage classification and testing.

This document does not apply to:

- fans; - air terminal devices with automatically controlled openings (variable openings).