Type B Vent Pipe

Answer:

It is likely you could use either a rigid or flexible B-vent pipe to accomplish this, but it must be one of the two. B-vent piping has a dual wall setup and would be needed for proper clearances. We carry a large line of B-vent piping manufactured by Simpson Duravent and Metalfab.

Answer:

I am assuming that this measurement is the outer diameter? If so, this is indeed 7 inch diameter B-vent piping and can use the Metal-Fab Type B Round Chimney Pipe Storm Collar - For Chimney Pipes with a 7 Inch Inner Diameter and the Metal-Fab Type B Round Universal Chimney Vent Cap - For 7 Inch Chimney Systems. Both items are designed with flexibility in mind and can be used with numerous brands of B-vent pipe.

Answer:

Due to the diameter of your piping, it is likely that the pipe will be self supporting without an issue. It is recommended that a brace be used if the pipe projects 5 feet or more above the roof. The pipe is designed to be air tight and will have at least one inch of overlap at each pipe joint. As such, water should not make its way into the pipe if the sections are attached properly. You should only need to add a roof flashing and storm collar in order to complete the transition to a free standing pipe.

Answer:

Do you know the brand of pipe with which you are dealing? Does the pipe feature twist-lock connections at the ends? You mention an inner and outer pipe. Are they two separate pipes? If so, what is the dimension of the inner pipe? We look forward to your response.