Removed old equipment and installed new Rheem 3 ton 18 seer communicating full gas system. Installed new return plenum with 16x25x4 filter, new emergency drain pan, new pan safety switch, new coil safety switch, new condensation pump, new thermostat, new line voltage monitor for outdoor unit and new composite pad. Reconnected supply plenum, high voltage, low voltage, drain line, gas line, and all return ducts. Tested system operations, set proper refrigerant charge. Will need to return with a 3x4 reducer for the exhaust vent. Should take 5 minutes to put on.