It seems there might be some confusion in your question, as "stove pipe" and "jam" are not terms that are typically used together or in relation to the same thing. Let's clarify the meaning of each term:
Stove Pipe: A stove pipe is a type of flue pipe used to vent smoke and combustion gases from a wood-burning stove, fireplace, or other solid-fuel-burning appliances. It connects the stove or fireplace to the chimney, allowing the exhaust to safely exit the building. Stove pipes are usually made of metal, such as galvanized steel or stainless steel, and they come in various diameters to suit different stoves and flue systems. Proper installation and maintenance of a stove pipe are essential for the safe and efficient operation of the appliance.
Jam: A "jam" can have various meanings depending on the context, but in the context of cooking or food, a jam typically refers to a type of sweet spread or preserve made from fruit, sugar, and sometimes pectin. Jams are cooked until the fruit softens and thickens, resulting in a spreadable consistency. They are commonly used as toppings for bread, toast, biscuits, or pastries, and they can also be used in desserts and as fillings for cakes and cookies.
If there's a specific context or different terms you meant to ask about, please feel free to clarify, and I'll be happy to provide more information!