The PelletVent Pro Single Tee creates a 90 degree offset with a twist-lock Cleanout Tee Cap for cleaning access. Branch swivels for easy alignment. PelletVent Pro is a venting system designed for stoves and inserts that use wood pellets and oil fuel. It is also built to vent corn and other biofuel products (Rated for continuous use flue temperatures up to 570? F).