8-1/2" Clear Chimney</br>3" Fitter 4" Bulge Diameter</br>Easy-to-install</br></br>Product Description</br></br>Westinghouse Lighting Corporation?? 8-1/2"Clear Chimney With 3" Fitter 4" Bulge Diameter?? easy to install.</br><br/>http://www.amazon.com/gp/product/B001AQ2B9GG