True North TN40 Pellet Insert - 33040001True North TN40 Pellet Insert 33040001 Review Are you looking for a pellet insert for your existing fireplace? Look no further the True North TN40 Pellet Insert 33040001 is the best choice! Simple to operate and easy to maintain, True North pellet inserts are a clean burning, low emissions biofuel heating alternative for your existing fireplace. Engineered for superior performance and durability, the TN40 pellet Insert is constructed from heavy gauge