CEN/TC 156/WG 4 - Air terminal devices

This document specifies methods for the testing and rating of dampers and valves used in air distribution systems with pressure differences up to 2 000 Pa.
The tests incorporated in this document will address:
-   leakage past a closed damper or valve (for classification, see Annex C);
-   casing leakage (for classification, see Annex C);
-   flow rate/pressure requirement characteristics;
-   torque: (see Annex A);
-   thermal transmittance: (see Annex B).
The tests specified above are applicable to the following:
-   measurement of leakage past a closed damper or valve;
-   measurement of casing leakage;
-   determination of flow rate and pressure requirements;
-   measurement of torque characteristics (see Annex A);
-   measurement of thermal transfer characteristics to determine insulation properties (see Annex B).
This document does not apply to the acoustic testing of dampers and valves.
NOTE   Certain aspects of the dynamic performance of dampers and/or valves are dependent upon the air distribution system to which they are connected and are, therefore, difficult to measure in isolation. Such considerations have led to the omission of these aspects of the dynamic performance measurements from this document. Also, in common with other air distribution components, the results from tests carried out in accordance with this document might not be directly applicable if the damper or valve is situated in an area of non-uniform flow.

This European Standard 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. This standard applies to laboratory testing of ATD for technical characterisation.
The standard gives only tests for the assessment of characteristics of the air terminal devices for mixed flow applications, under non-isothermal conditions with a cold jet. It does not cover the testing of isothermal or low velocity terminal devices which are covered by other published standards.
This European Standard applies to ventilation or air conditioning systems designed for the maintenance of comfort conditions for buildings. It is not applicable in the case of systems for the control of industrial or other special process environments. In the latter case however, it may be referred to if the system technology is similar to that of the above mentioned ventilation and air conditioning systems.
The principles described in this European Standard can also be used on site or in a lab for full-scale measurements.

This European Standard is applicable to measure some parameters of thermal and acoustic comfort (i.e. temperatures, air velocities…) in a room with an air diffusion system.
This European Standard can be used on site or in a lab for full-scale measurements.
This European Standard applies to ventilation or air conditioning systems designed to maintain the comfort conditions in buildings. It is not applicable in the case of systems for the control of industrial or other special process environments.
NOTE   In the latter case however, it may be referred to if the system technology is similar to that of the above mentioned ventilation and air conditioning systems.

This European Standard specifies methods for measuring the cooling capacity of chilled beams with forced air flow. The evaluation of aerodynamic air performance should be based on the requirements of WI 00156113 and the requirements set out in this standard.
The purpose of the standard is to give comparable and repeatable product data.
The test method applies to all types of convector cooling systems with forced air supply using any medium as energy transport medium. This standard only applies to situations where induced air only passes through the heat exchanger (primary air does not pass through the heat exchanger).
NOTE   The result is valid only for the specified test set up. For other conditions, (i.e. different positions of heat loads, inactive ceiling elements around the test objects), the producer should give guidance based on full scale tests.
This standard refers to water as the main cooling medium, with the possibility of additional cooling from the primary air. Wherever water is written, any other cooling medium can also be used in the test.

This European Standard specifies methods for the laboratory aerodynamic testing and rating of the air flow rate measurement accuracy of fixed air flow rate measurement devices, including supply and exhaust air terminal devices (ATD) and in-duct measurement stations (IMS) and the sensitivity of such devices to flow disturbance. A general overview of different test configurations is shown in Figure 1.

This standard specifies the main characteristics of air velocity measuring devices. This includes requirements for thermal velocity probes, recalibration and the signal processing of measurements in a ventilated space, including  those in the air jet and in the occupied zone.  Other types of velocity measuring devices should fulfil the performance parameters stated but appropriate calibration techniques should not necessarily be used which are described in this standard

This European Standard specifies methods for the aerodynamic testing and rating of constant and variable flow rate terminal units suitable for use with air distribution systems.
The terminal units considered are:
- Single and dual duct.
- Induction.
- Fan assisted induction (parallel and series).
- Single duct with integral diffuser.
The tests for each type of unit are summarized in Figure 1.
The tests in this standard are designed to determine fully the aerodynamic performance of terminal units and provide a basis for the comparison of the suitability of such assemblies when correctly installed in an air distribution system.

This European Standard 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.
The standard gives only tests for the assessment of characteristics of the air terminal devices under isothermal conditions.
The testing of low velocity air terminal devices is specified in EN 12239.

This European Standard specifies methods for the laboratory aerodynamic testing and rating of low velocity air terminal devices for displacement flow applications, including the specification of suitable test facilities and measurement techniques.
The standard gives only tests for the assessment of characteristics of the air terminal devices under non-isothermal conditions.
This standard applies to Class IV air terminal devices as defined in EN 12238.

This European Standard specifies a method for measuring the water rejection performance of louvres subject to simulated rain and wind pressures, both with and without air flow through the louvre under test. For the purpose of tests in this standard, a 1000 mm ´ 1000 mm section of weather louvre or the nearest possible blade increment is considered.
Weather louvres are designed to restrict the passage of water during rainfall while allowing the passage of air into or from an air distribution system or part of a building. They are used in a wide range of applications, where there may be differences in wind speed and direction, levels of local turbulence, rate and droplet size, distribution of rainfall and surface water flow from the surrounding structure. It is impractical to consider a standard test procedure simulating the whole range of likely conditions, but this standard provides for heavy rainfall directed on to the louvre surface, with simulated wind pressures. This provides a common basis on which to compare the water rejection performance of weather louvres of different designs. This standard is not intended for the evaluation of weather performance of pressure relief dampers.
The purpose of tests incorporated in this European Standard is as follows:
a) Weather tests
To establish the weather louvre effectiveness when subjected to wind pressure at various air flow rates.
b) Discharge and Entry loss coefficient/Pressure requirements
To establish the air pressure loss through the weather louvre at various air flow rates and by calculation the Discharge and Entry Loss Coefficient.

This European Standard specifies structural classifications for floor mounted Air Terminal Devices (ATD's) in respect of their possible applications and the following related structural test methods: Static test methods. Impact test methods. Dynamic test methods.
Electrical continuity requirements for platform raised floor systems and components are not covered in this standard.
Requirements for aerodynamic and acoustic testing of air terminal devices are not covered in this standard.
The standard does not deal with any simulations relating to the wear characteristics of Air Terminal Devices.

This European Standard specifies a method for measuring the sand rejection efficiency of sand trap louvres subject to simulated sand and with inlet air flow through the louvre under test. The Standard considers a 1000 mm ´ 1000 mm section of sand trap louvre, or the nearest possible blade increment, for evaluation purposes.
The purpose of the tests incorporated in this European Standard is as follows:
a) Sand Rejection Effectiveness
To establish the sand rejection effectiveness when subjected to various air flow rates through the assembly.
b) Entry loss coefficient/Pressure requirements
To establish the air pressure loss through the sand trap louvre at various air flow rates and by calculation Discharge Loss Coefficient.

This standard applies to measurement of airflows on site. It provides the technician with a description of the methods,
their protocols, and tables for noting measured and calculated values so that the necessary measurements are
performed within the margins of stipulated method uncertainties.
Note : The duct traverse method in this standard is an alternative method to the duct traverse method of ISO 3966 and
EN12599. It defines errors due to the simplified approach and describes also other methods of measurements.

To specify the performance requirements for specifying comfort criteria within ventilation systems.

This European Standard specifies simplified methods for the measurement of air flows on site. It provides a description of the air flow methods and how measurements are performed within the margins of stipulated method uncertainties.
One measurement method is to take point velocity measurements across a cross-section of a duct to obtain the air flow. This simplified method is an alternative to the method described in ISO 3966 and EN 12599. This European Standard requests certain measurement conditions (length of straight duct and uniform velocity profile) to be met to achieve the stipulated measurement uncertainties for the simplified method.

This European Standard specifies methods for the testing and rating of dampers and valves used in air distribution systems with pressure differences up to 2 000 Pa.
The tests incorporated in this European Standard are:
a)   leakage past a closed damper or valve (for classification see Annex C);
b)   casing leakage (for classification see Annex C);
c)   flow rate/pressure requirement characteristics;
d)   torque: (see Annex A);
e)   thermal transmittance: (see Annex B).
The acoustic testing of dampers and valves is not included in this European Standard.
The tests specified above apply to the following:
f)   measurement of leakage past a closed damper or valve;
g)   measurement of casing leakage;
h)   determination of flow rate and pressure requirements;
i)   measurement of torque characteristics (see Annex A);
j)   measurement of thermal transfer characteristics to determine insulation properties (see Annex B).
NOTE   Certain aspects of the dynamic performance of dampers or valves are dependent upon the air distribution system to which they are connected and are, therefore, difficult to measure in isolation. Such considerations have led to the omission of these aspects of the dynamic performance measurements from this European Standard. Also, in common with other air distribution components, the results from tests carried out in accordance with this European Standard may not be directly applicable if the damper or valve is situated in an area of non-uniform flow.

This European Standard specifies methods for the testing and rating of dampers and valves used in air distribution systems with pressure differences up to 2000 Pa. The tests incorporated in this European Standard are: a) leakage past a closed damper or valve (for classification see annex C); b) casing leakage (for classification see annex C); c) flow rate/pressure requirement characteristics; d) torque: (see annex A); e) thermal transmittance: (see annex B).