[EN 12792:2003, 92]:air terminal device intended to be installed above a natural ventilation exhaust duct with the aim, by creating negative pressure and depending on wind speed, of avoiding reverse flow and increasing flow rate. It may or may not … Continue reading →

[AIVC, Air infiltration and ventilation glossary, 1992]:the total length of the narrow gaps found around doors and windows etc, through which ventilation air may pass.(see component leakage) 

[AIVC, Air infiltration and ventilation glossary, 1992]:a shallow space in a building, usually under the floor, which provides access to pipes, wires and other equipment.