ABOUT THIS SYSTEM: Mix & Match Wall Mount and/or Ceiling Cassette for your custom system. Please select from below each of the indoor units. It is not required to use all five zones. The sum of the total indoor BTUs can not exceed 51K. Example: 15+18+18=51K BTU (suitable), 6+6+6+6+24=48K BTU (suitable), 9+12+15+18=54K BTU (NOT suitable). _____________________________________________________________________________________________ ATTENTION HOME OWNERS: Purchase of this system will require a licensed technician. DO NOT underestimate the complexity when using a branch box. Protect your investment and only allow a skilled professional to do the installation.