What is BS EN 12238 - Aerodynamic testing and rating of air terminal devices about?
Terminal airflow devices are a type of air handling system that is generally used in conjunction with air volume flow systems, for efficient airflow in the occupied space.
BS EN 12238 is a European Standard that discusses air terminal devices for building ventilation.
The main objective of BS EN 12238 is to provide best industry methods to ensure air terminal devices play a positive role in the operational efficiency and performance of ventilation systems.
BS EN 12238 specifies methods for the laboratory aerodynamic testing and rating of air terminal devices for mixed flow applications, including the specification of suitable test facilities and measurement techniques.
BS EN 12238 gives only tests for the assessment of characteristics of the air terminal devices under isothermal conditions.
Note: The testing of low-velocity air terminal devices is specified in EN 12239.
Who is BS EN 12238 - Aerodynamic testing and rating of air terminal devices for? 
BS EN 12238 on aerodynamic testing and rating of air terminal devices is relevant to: 
- Manufacturers of ventilation and air conditioning systems
- Manufacturers of air terminal devices
- Quality control and testing personnel
- Mechanical engineers
- Product designers
- Testing laboratories
- Building designers and architects
Why should you use BS EN 12238 - Aerodynamic testing and rating of air terminal devices?
It is vital that the aerodynamic performance of air terminal devices be assessed in order to maintain steady conversion of energy and efficient airflow through ducts.
In this regard, BS EN 12238 provides best industry guidance on measurement of air flow rate, pressure, temperature and velocity. Moreover, tests to measure the isothermal air discharge characteristics of a supply air terminal device is also covered by BS EN 12238.
Alternative exploratory technique for determination of throw, spread and drop has also been discussed in BS EN 12238.
As a result, if you are a manufacturer of air terminal devices used for building ventilation, by adopting BS EN 12238 test methods and can determine whether your products are reliable and effective for use. With appropriate aerodynamic testing and rating, you can ensure that the air terminal devices are free of acoustical disturbances which could impair the overall performance and efficiency of the device.
