A ventiduct is a term commonly used to refer to a ventilation system or apparatus. There are several synonyms for this word, including air duct, airway, ventilation duct, and exhaust duct. These terms all refer to a system that transports air or other substances throughout a building or enclosed space. Some other synonyms for ventiduct include ductwork, air circulation system, and HVAC system. Each of these terms may be used in slightly different contexts or to describe different types of ventilation systems, but ultimately they all refer to the same basic concept of moving air or other substances in and out of a space for ventilation purposes.