The Furnace Twinning Kit (FTK) provides the means for two (2) Amana brand or Goodman brand gas furnaces containing an Integrated Ignition control to operate at the same time from a single thermostat. The two furnaces to be ”twinned” must be exactly the same model with their circulating air blowers set to deliver the same air flow at the same time. The furnaces may deliver different CFMs in the cooling mode, if appropriate. THIS KIT CANNOT BE USED TO CONTROL MORE THAN TWO (2) FURNACES. When properly installed, these furnaces will achieve the operational and performance specifications described in the installation instructions. For items not covered in this manual, follow the installation instructions shipped with the furnaces.