a swimming pool plant room with blurred warning sign outside on the wall

caution plant room sign outside swimming pool machines machinery boiler tank pipeworks pipework electrical switches pump chemicals signage brick wall saying keep locked shut unauthorized access unauthorised warning danger fuse boxes complicated plumbing schematic intricate pattern maze piping tubes tubing circulation filtration equipment indoor installation air handling unit heating ventilation space plan layout ordered order yellow blue red factory warehouse facility portrait shot close house white aluminum copper insulated safety blurred