Check out www.siliconehose.com. I found a 4 ply silicone hose with an inside diameter of 3.380". Perfect for a 8877 chimney. I ordered a piece and it works great. I put 10kv on it with no leakage current. Look at the link for silicone straight hose. For $2.22 you can have a chimney. 73, Mike KF8OD