EntityQ6804522· pop 7· linked from 266 articlesmechanical floorSign in to savemechanical rooms-only skyscraper sectionConnectionsWorld Trade Center (1973–2001)ConceptWillis TowerEntityUniversity of California, Los AngelesEntitytriskaidekaphobiaEntityornamentEntitystoreyEntitypantryEntityvestibuleEntitylobbyEntitybackyardEntityequipment roomEntityNew York CityCityShanghaiCityarchitectureEntityhouseEntitylibraryEntityelectronicsEntityInternational Standard Book NumberEntitywindowEntityMinneapolisConceptCategoriesFloorsHeating, ventilation, and air conditioningRoomsSkyscrapers