I just received and am preparing to install my new SS liner (flex king 6"). I have searched extensively both here and other places online but have been unable to find an answer to my question. The chimney I am relining is circa 1957 constructed of 16" square cinder block lined with 7" inside diameter square terra-cotta. The chimney itself is in good shape and drafts well when warm but with my new EPA stove I think it will work better with a 6" liner. My question is what bad could happen if I left the cap off the bottom of the T member? I sweep my own chimney and the existing chimney has a cleanout door at the bottom; if I left the cap off the bottom of the T I would be able to sweep it straight down the chimney and remove it through the cleanout door. I understand that if I leave the cap off the bottom of the T member then as the chimney cools there could be a possibility gasses cooling and settling at the bottom of the chimney. Does anyone else have experience with this issue? It just seems to me that it would be much easier to remove the soot/creosote swept down from the bottom of the chimney instead of pulling the stove pipe off and vaccuming it out of the cap on the T member. Thoughts? Suggestions? Potential dangers? If anyone needs pics to beeter understand what I am describing just lemme know...