The aim of this document is to enhance the enforcement of Ecodesign and Energy Labelling requirements for bidirectional residential ventilation units placed and put into service on the EU market. It is principally addressed to suppliers and market surveillance authorities. The first six chapters provide the general legislative background and an overview of the specific requirements to which suppliers are subject. Chapter 7, particularly aimed at market surveillance authorities, presents practical tips to facilitate effective compliance monitoring. Chapter 8 outlines the benefits of voluntary third-party certification for monitoring product compliance.