Caliduct is a relatively obscure word that refers to a heating duct or a hot-air vent. Synonyms for Caliduct include warm air duct, heated vent, hot-air supply, warm-air dissemination system, and heated overhead ventilation system. These synonyms are useful if you are designing or installing a heating or ventilation system, or if you need to describe an existing system for maintenance or repair purposes. The use of these synonyms can help to make technical communications more precise and concise, and can help to avoid confusion or misunderstandings. Whether you are an HVAC professional or a layperson, knowing these synonyms can be helpful in many different situations.