Abstract: An installation for coating objects, more particularly vehicle bodies and/or vehicle body parts, having a coating booth having an air supply chamber and an application area which are spatially separated by a flow-permeable booth ceiling. An air system is set up in such a way that conditioned air can be supplied to the air supply chamber and said conditioned air flows further through the application area as booth air. In the application area, at least one application unit is arranged, wherein in the application area overspray occurs that is taken up by and carried in the booth air. The air system includes a flow guiding unit having a flow rectifier structure that is set up in such a way that the flow of the air supplied to the air supply chamber is homogenised. A method for coating objects with an installation of this kind is also provided.