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Systemair - Guide to the Building Regulations Part L2

Building Regulations Part L2 - Ecodesign Directive - Air Handling Units - ErP

Ecodesign Directive 1253/2014 - Air Handling Units

The Ecodesign directive outlines minimum requirements for heat recovery efficiency, fan efficiency and SFP internal values.

The directive applies to occupied spaces ventilated with outdoor fresh air, process ventilation e.g. heat removal is not covered by the directive.

Non-Residential (NRVU) units are classified under the directive with airflows from 280 l/s onwards.

Bidirectional (BVU) units are those producing an airflow between indoor and outdoor via supply and extract fans.

All BVU products must incorporate heat recovery in the form of Thermal Wheel, Counterflow, Plate or Run Around Coil.

Air recirculation (Mixing) is only permissible if the fresh air content is 10% or less of the total ventilation rate without a separate heat recovery device.

The Specific Fan Power (SFP) is a ratio of power consumed to the amount of air moved by a ventilation system i.e. W/I/s or kW/m³/s. SFP is greatly influenced by system resistance and reducing by design is an effective method of achieving the requirements of Part L2A.

The requirements are defined by application and differentiate between a new build and an existing building.

Central System - A supply and extract system serving the whole or major parts of a building.

Zonal System - A system which serves a group of rooms forming part of a building (i.e. a zone where ducting is required).

Local Unit - An unducted ventilation unit serving a single area.

Kitchen Extract - A new category for 2013.

All Systemair products meet the ErP requirements of 2017 and are CE marked accordingly. Incorporating the highly energy efficient EC (electronically commutated) permanent magnet (PM) motors (IE4) for up to a third reduction in energy consumption compared to conventional AC motors to meet the demanding requirements of Part L 2014.

Systemair manufactures one of the largest ranges of high efficiency EC products incorporating thermal wheels and demand controls.

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