Furnace start up. Cycled system. Checked all electrical connections and tightened. Removed clamp on exhaust venting. Installed correctly. Checked and adjusted drain line. Checked for gas leaks worn sniffer, none found. Checked inlet and outlet gas pressures. Checked and adjusted gas pressures to maximize efficiency. Checked venting. Preformed combustion test and found normal levels in exhaust. No CO found in airstream. System operating normal at this time. Job complete.