large air conditioning unit on roof

air airway architecture axial big boiler building chiller chimney circle cold commerce commercial condenser condensers conditioner conditioning conservation consumption contractor cool cooling corrugated culvert current curve cylinder double duct electrical electricity exchanger exhaust factory fan fans grid grill heat hot house huge hvac industrial industry infrastructure iron metallic oriented outdoor oxygen ozone pipe pipework polution power roof rooftop room round sky stainless steel summer surface tank temperature trade tube unit urban vapor vent ventilate ventilated ventilation voltage volts wattage watts