Planning on installing a wood stove in my pole barn garage. I have the wood stove positioned and the single wall black pipe installed up to the 90 that will go through the wall of the pole barn. I installed a 13 inch diameter ceramic crock through the side of the pole barn and placed on the inside brick all the way around the crock. This encased the crock from any combustibles. As i run the single wall pipe through the crock to the outside, do i then connect to double wall stainless pipe and if so is there a connector to affix the two pipe. or could i continue with the single wall pipe and finish the job.