This runs from an insert, or the hearth stove, and connects to the very first flue tile.
AGP Pellet Stove Insert by Lopi Stoves
The AGP™ Pellet Stove Insert is easy to use, easy to own and easy to live with. AGP stands for ALL GRADES of wood pellets which this insert is designed to burn. Burning multiple grades of pellets is an environmentally sound way to heat your home because the pellets are made from all-natural wood by-products.