Caution plant room sign outside a swimming pool plant room machines machinery boiler tank pipeworks pipework electrical switches pump room chemicals signage on brick wall outside saying plant room keep locked shut and no unauthorized access unauthorised warning danger fuse boxes complicated plumbing schematic intricate pattern maze piping tubes tubing pool circulation filtration equipment indoor installation air handling unit heating ventilation space plan layout ordered order yellow blue red unit factory warehouse facility pump house red white aluminum copper insulated safety

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拍攝者： Nicecloud