When the vent is not a straight shot you'll need an elbow or an offset. Whatever your venting system requires we have you covered. Often elbows reduce vent run distance or limit vent capacity. Always refer to the installation instructions of the appliance or venting system. We carry elbows for SmartFlex, DVL Double wall, Ventinox, DuraVent, DirectVent Pro, Snap-Lock Stovepipe, DuraBlack, Galvanized Connector Pipe, PelletVent Pro, and DuraFlex.