Vehicle air conditioner

An air-conditioner adapted to be fitted to a vehicle, the air-conditioner comprising:

• an external unit containing a compressor and at least one heat exchanger element, wherein the external unit comprises at least one air channel positioned to supply conditioned air and at least one air channel positioned to receive return air through an opening in a roof or wall of the vehicle, the at least one air channel adapted for positioning in a first opening of a first size and a second opening of a second size;
• a frame adapted to be installed in the first opening and the second opening and between the external unit and the roof or wall and having projections on each of a first side and an opposite second side of the frame, the projections being configured together to locate the frame in the openings and to locate the frame in the external unit;
• wherein the projections on the frame are positioned so that:
• when the opening is the first size, the frame is adapted to be installed with the first side facing the roof or wall, and when the opening is the second size, the frame is capable of being rotated to be installed with the first side facing the external unit.