[AIVC, Air infiltration and ventilation glossary, 1992]:extracted air which is re-supplied to a space. Recirculated air is normally blended with outside air and is reconditioned.[ASHRAE Standard 62.1]:air removed from a space and reused as supply air.(see air, recirculation)[ISO 16814:2008, 3.35]:air removed from a space and reused as supplied air.