Baffle Boards don’t just take up space inside your wood-burning stove or fireplace insert; they have various purposes. They don’t have to be a baffling mystery; they are an essential part of your heating stove for various reasons. Strength Over the years, baffle boards have been made from various materials. The baffle boards we provide are made from heavy-duty fiberboard that is thicker and more durable than standard factory boards. Boards and Blanket Kits .