This European Standard describes the method to calculate the ventilation air flow rates for buildings
to be used for applications such as energy calculations, heat and cooling load calculation, summer
comfort and indoor air quality evaluation.
The ventilation and air tightness requirements (as IAQ, heating and cooling, safety, fire protection…)
are not part of the standard.
For these different applications, the same iterative method is used but the input parameter should be
selected according to the field of application. For specific applications a direct calculation is also
defined in this standard. A simplified approach is also allowed at national level following prescribed
rules of implementation.
The method is meant to be applied to:
Mechanically ventilated building (mechanical exhaust, mechanical supply or balanced system).
Passive ducts.
Hybrid system switching between mechanical and natural modes.
Windows opening by manual operation for airing or summer comfort issues.
Automatic windows (or openings) are not directly considered here.
Industry process ventilation is out of the scope.
Kitchens where cooking is for immediate use are part of the standards (including restaurants..)
Other kitchens are not part of the standard.
The standard is not directly applicable for buildings higher than 100 m and rooms where vertical air
temperature difference is higher than 15K.
The results provided by the standard are the building envelope flows either through leakages or
purpose provided openings and the air flows due to the ventilation system, taking into account the
product and system characteristics.
EN 15242:2007 Referenced Document
EN 12237 Ventilation for buildings - Ductwork - Strength and leakage of circular sheet metal ducts
EN 12792:2003 Ventilation for buildings - Symbols, terminology and graphical symbols
EN 13141-5 Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 5: Cowls and roof outlet terminal devices*， 2024-04-19 Update
EN 13779 Ventilation for non-residential buildings - Performance requirements for ventilation and room-conditioning systems
EN 14239 Ventilation for buildings - Ductwork - Measurement of ductwork surface area
EN 1507 Ventilation for buildings - Sheet metal air ducts with rectangular section - Requirements for strength and leakage
EN 15251 Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics
EN 1886 Ventilation for buildings - Air handling units - Mechanical performance*， 2024-04-19 Update
EN 15242:2007 history
2007EN 15242:2007 Ventilation for buildings - Calculation methods for the determination of air flow rates in buildings including infiltration