Class A Chimney Pipe: we stock Simpson Dura-Tech Class A chimney pipe for wood stove flues. You can contact our sister company, Professional Chimney Sweeps, to install the flues OR Do-it-yourself with the easy to use instruction manual that comes with it. Stove Pipe: we stock two kinds of stove pipe. Simpson Dura-Vent 24 Ga. Single wall pipe and Ventis Black 22 Ga. Heavy Duty Single wall stove pipe.