Telescoping Flue Extension For Wcn1 Curved Front Chimney Range Hoods. Chimney Flue Extensions Are Specially Designed For Ceilings Of 10 Or 11 Feet To Hide The Duct And Keep The Beauty In Your Kitchen. (Ul)(Li)Seamless Construction(/Li)(Li)Reversible Design For Both Ducted And Non-Ducted Applications(/Li)(Li)Simply Replaces Upper Section Of Standard Flue Extension That Comes With Hood(/Li)(/Ul)