Complete 1 System Payne Gas Pak. Came to complete job. Came to replace flue cover. Had to remove inducer, gas valve electrical panel. Installed new flue cover. Installed back every thing else. Cycled system. Let HO know she would have to leave door open for a few mins due to first start on new heat exchanger would creat some smoke. Ran system for a few mins. System is running great st this time.