Mainframe of an air conditioner

An air conditioner mainframe comprising:

• a base frame having a compressor chamber and a condenser chamber respectively defined by a first partition wall and a second partition wall, an air intake passage defined between said first partition wall and said second partition wall, and an upright fan support disposed inside said condenser chamber, said compressor chamber and said condenser chamber having a respective front opening and a respective top opening, said second partition wall being slotted;
• a shell fastened to said base frame and covered over the front openings of said compressor chamber and said condenser chamber, having an air outlet;
• a condenser having a substantially U-shaped profile mounted inside said condenser chamber and closely attached to said second partition wall;
• a compressor fixedly mounted inside said compressor chamber and controlled to compress a cooling agent through said condenser for heat exchange;
• a fan mounted on said upright fan support and controlled to draw outside air through said second partition wall and said air intake passage into said condenser chamber for heat exchange with said condenser and to drive cool air out of said condenser chamber through the air outlet of said shell;
• and a top cover fastened to said base frame and covered the top openings of said compressor chamber and said condenser chamber.