Addition and/or Alterations - EZ PERMIT DUCTWORK & WARM-AIR APPLIANCES - For the installation of New Ductwork, Registers/Grilles/Diffusers, and Warm-Air Appliances as per attached standards. Deviations from these standards require submission of construction and site plans. Replace the existing furnace only, in like and kind, using the existing ductwork. The modification/ addition of some trunk duct will be done in the basement only. It will all be exposed and tied back into the existing ducts going upstairs.