SAV’s David Bradbury said: “Addressing this problem whilst maintaining acceptable Indoor Air Quality (IAQ) requires a new generation of Smart Ventilation Units (SVUs). Such SVUs need to ensure an acceptable Draught Rating in line with ISO 7730 (Ergonomics of the thermal environment) through a combination of two key factors: close control of inlet air temperature and sufficient mixing of inlet air and room air before the air hits the occupied zone.”

SVUs use smart control of inlet air temperature to ensure the set point inlet temperature is maintained, regardless of external temperature. In parallel, they exploit the Coanda effect to move the supply air across the ceiling for six to eight metres, thereby entraining and mixing room air before the inlet air falls to the occupied zone.

Mr Bradbury concluded: “Whilst draught control may seem relatively simple, there are actually several factors that need to be controlled simultaneously – something that old-style ventilation controls could not do. In using smart control systems, the new generation of SVUs is able to deliver effective draught control to maintain optimum comfort, energy efficiency and IAQ.”