CEN/TC 156/WG 5 - Air handling units

This document specifies requirements and testing for rating and performance of Non Residential Ventilation Units, NRVU’s, specifically Air Handling Units (AHU’s). It specifies requirements, classifications and testing of components and sections of air handling units.
This document applies to tests in a laboratory and in situ. This document is applicable both for mass produced air handling units and tailor-made Air Handling Units.
This document applies to AHU and individual sections of AHU with the designed air flow > 250 m3 · h−1. This document applies to UVU's with additional air treatment components in addition to filtration.
This standard does not include:
-   residential unidirectional and bidirectional ventilation units;
-   nonresidential unidirectional ventilation units which consist of only a casing, a fan with or without filter.
NOTE 1   Residential ventilation units are covered by EN 13142.
NOTE 2   Nonresidential unidirectional ventilation units which consists only casing, fan with or without filter are covered by EN 17291.

This standard specifies test methods, test requirements and classifications for air handling units, which are supplying and/or extracting air via a ductwork ventilating/conditioning a part or the whole of the building. This standard is not applicable to the following:
a)   air conditioning units serving a limited area in a building, such as fan coil units;
b)   units for residential buildings;
c)   units producing ventilation air mainly for a manufacturing process.
Except for the thermal and acoustic performance of the casing, the test methods and requirements are applicable to both complete units and any separate sections.
The filter bypass test is not applicable to the testing of high efficiency particulate air filters (HEPA).
NOTE   HEPA filters are recommended to be installed downstream of the air handling unit. Such installations should be leak tested in accordance with the appropriate filter standards.
The test method for the thermal performance of the casing is applicable to the comparison of different constructions, but not to the calculation of thermal losses through casing or the risk of condensation.
Similarly, the test method for the acoustic performance of the casing is applicable to the comparison of different constructions, but not to the provision of accurate acoustic data for specific units.

This document specifies laboratory test methods, test requirements and classifications for the casings of non-residential air handling units (AHU). For the leakage tests, a method for on-site testing is also included.
The test methods and requirements are applicable to both model boxes and real units, except for the thermal and acoustic performance of the casing.
The test method for the thermal performance of the casing is applicable to the comparison of different casing constructions, but not for the calculation of thermal losses through casing or the risk of condensation.
The test method for the acoustic performance of the casing is applicable for the comparison of different constructions, but not for the provision of accurate acoustic data for specific units.
This document is not applicable for fan-coil units and similar products.
The filter bypass test specified in this document is not applicable to high efficiency particulate air (HEPA) filter installations.

To amend EN to address issues regarding energy classification of Air Handling Units as a result of discussions in Eurovent WG6C.

This European Standard specifies requirements and testing for ratings and performance of air handling units as a whole. It also specifies requirements, recommendations, classification, and testing of specific components and sections of air handling units. For many components and sections it refers to component standards, but it also specifies restrictions or applications of standards developed for stand alone components.
This standard is applicable both to standardised designs, which may be in a range of sizes having common construction concepts, and also to custom-design units. It also applies both to air handling units, which are completely prefabricated, and to units which are built up on site. Generally the units within the scope of this standard include at least a fan, a heat exchanger and an air filter.
This standard is not applicable to the following:
a)   air conditioning units serving a limited area in a building, such as fan coil units;
b)   units for residential buildings;
c)   units producing ventilation air mainly for a manufacturing process.

This European Standard specifies requirements and testing for ratings and performance of air handling units as a whole. It also specifies requirements, recommendations, classification, and testing of specific components and sections of air handling units. For many components and sections it refers to component standards, but it also specifies restrictions or applications of standards developed for stand alone components.
This standard is applicable both to standardised designs, which may be in a range of sizes having common construction concepts, and also to custom-design units. It also applies both to air handling units, which are completely prefabricated, and to units which are built up on site. Generally the units within the scope of this standard include at least a fan, a heat exchanger and an air filter.
This standard is not applicable to the following:
a)   air conditioning units serving a limited area in a building, such as fan coil units;
b)   units for residential buildings;
c)   units producing ventilation air mainly for a manufacturing process.

This standard specifies test methods, test requirements and classifications for air handling units which are supplying and/or exhausting air, via ductwork, for the ventilating/conditioning of part or the whole of the building. This standard is not applicable to the following: a) air conditioning units serving a limited area in a building, such as fan coil units ; b) units for residential buildings; c) units producing ventilation air mainly for a manufacturing process.

This European Standard specifies requirements and testing for ratings and performance of air handling units as a whole.
It also specifies requirements, classification, and testing of specific components and sections of air handling units. For many components and sections it refers to component standards, but it also specifies restrictions or applications of standards developed for standalone components.
This standard is applicable both to standardized designs, which may be in a range of sizes having common construction concepts, and also to custom-design units. It also applies both to air handling units, which are completely prefabricated, and to units which are built up on site. Generally the units within the scope of this standard include at least a fan, a heat exchanger and an air filter.
This standard is not applicable to the following:
a) air conditioning units serving a limited area in a building, such as fan coil units;
b) units for residential buildings;
c) units producing ventilation air mainly for a manufacturing process.

TC - New Equations 3 and 4 and improved drawings