Monessen LE30 30 Degree Offset Elbow Package. Monessen is a company that designs a large line up of upgraded fireplaces and stoves designed to make your existing fireplace or new wood burning stove really stand out with style and exceptional style and performance. This Monessen LE30 30 Degree Offset Elbow Package allows the vent runs to be ran with single or multiple bends. This offset elbow is ideal for improved air movement and better heating conditions. When this elbow is installed correctly you can count on both safety of your home, and performance that you can rely on during all those colds days throughout the year.