The Primary/Secondary Modular (MMY/MSY) fan coil unit is ideal for applications where design restricts the installation of IEC's Ditto or Siamese Ditto systems. With this configuration, field brazing is required to complete the piping between two separate Modular Hi-Rise fan coil units. Standard MMY/MSY units are provided with a galvanized finish on the cabinet and a powder-coat paint finish on the return air panel.