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Air duct, air conditioner pipe, fire sprinkler and wiring system. Building interior. Ceiling lamp light with opened light. Royalty Free Stock Photo

Air duct, air conditioner pipe, wiring pipe, and fire sprinkler system. Air flow and ventilation system. Building interior. Royalty Free Stock Photo

Air duct, automatic fire sprinkler safety system. Fire protection and detector. Fire sprinkler system. Building interior concept. Royalty Free Stock Photo

Air duct, air conditioner pipe, fire sprinkler and wiring system. Building interior. Ceiling lamp light with opened light.

Air duct, air ventilation system in shopping mall building. Air conditioner pipe and plumbing pipe . Ceiling lamp light Royalty Free Stock Photo

Air duct, air conditioner pipe and fire sprinkler system on white ceiling wall. Air flow and ventilation system. Building interior Royalty Free Stock Photo

Ceiling lamp with opened light and air duct hanging on ceiling. Air conditioner pipe system. Air ventilation system. Fire sprinkle Royalty Free Stock Photo

Air duct, air conditioner pipe, fire sprinkler and wiring system. Building interior. Ceiling lamp light with opened light. Interior architecture. Glass wall building and exterior garden with sunlight