Zero clearance chimney

Does any body make a zero clearance chimney? I have a 6" b vent system in my home that was double wall and enclosed in a 9"x9" wood chase. Is there any way to run a wood burning chimney through it. After I rip out the metalbestos b vent? I seen a post for zero clearance liners and that is what made me think there might be an option for me. I sized it out with the traditional double wall pipe and 2" clearance tocombustibles and I do not have enough room. Hopefully someone can advise

im not aware of one that will fit in that tight an enclosure and still provide clearances necessary. i would imagine that a "zero clearance" pipe would likely be too large an OD for that size as well. i may be wrong but i do not think you will find one. you might check with simpson duravent at www.duravent.com or call them at 800-245-6489 and inquire. if it exists im sure they will let you know about it. i hope im wrong and you find somthing compatable that still meets code. good luck in your search.

gave wrong phone number for duravent 800-835-4429 sorry , my mistake, gave you my office number , lol