exploring a modern office ceiling design with integrated lighting and ventilation systems - 出風口 個影片檔及 b 捲影像00:13
steam rising from con edison pipes filling the sky between buildings in new york city - 出風口 個影片檔及 b 捲影像00:11
employee operates bending machine in a metalworking company - bending of sheet metal for further processing - 出風口 個影片檔及 b 捲影像00:23
view from a ship's deck focusing on the ship's superstructure with masts, a large funnel, numerous ropes, and rigging. the sea is relatively calm at... - 出風口 個影片檔及 b 捲影像00:13
male electrician in protective gear installing a new ac unit outdoors on a roof. mounting and repairing the fans and radiators - 出風口 個影片檔及 b 捲影像00:25冷氣
male engineer in protective gear installing a new ac unit on the wall indoors. mounting and repairing the electronic wires - 出風口 個影片檔及 b 捲影像00:11
engineer in protective gear installing a new ac unit outdoors. mounting and repairing the fans and giving thumbs up gesture - 出風口 個影片檔及 b 捲影像00:15冷氣
male engineer in protective gear installing a new ac unit outdoors. mounting the fan and radiator - 出風口 個影片檔及 b 捲影像00:11冷氣
air conditioning on wall of roof for maintenance, building or construction of fan hvac repair. air conditioner on a wall outdoor - 出風口 個影片檔及 b 捲影像00:06冷氣
cooling fans at the plant aerial view. cooling system in a factory aerial view. big industrial fan. - 出風口 個影片檔及 b 捲影像00:18冷氣
cooling fans at the plant aerial view. cooling system in a factory aerial view. big industrial fan. - 出風口 個影片檔及 b 捲影像00:11冷氣
close-up of filter in home hvac system return air duct, san ramon, california, september 13, 2020. - 出風口 個影片檔及 b 捲影像00:10
wide angle of wood ceiling. air ducts. see shadows of windows on wall. could be loft, library, academic building, university, or warehouse. - 出風口 個影片檔及 b 捲影像00:11
man examining controls for booster fans in mine, ventilation equipment for booster fans in mine / united kingdom - 出風口 個影片檔及 b 捲影像00:53
february 14, 2009 montage smokestacks and vents blowing smoke against yellow sky / ottawa, ontario, canada - 出風口 個影片檔及 b 捲影像00:11