air conditioning unit on roof

air airway architecture axial big black blue boiler chiller chimney circle clouds condenser condensers conditioner conditioning contemporary cool cooling corrugated culvert curve curvy cylinder double duct electrical exchanger exhaust factory fan grill grille heat hollow house huge hvac industrial industry infrastructure iron mechanical metallic modern orriented outdoor oxygen pipe pipeline pipework polution ribbed roof room round shaft shiny silver sky skyscrapper stainless steam steel summer surface tank temperature tube tubing unit urban vapor vent ventilate ventilated ventilation water white zinc