My Napoleon 1402 is here so I need to get my liner. I'm going to go 5.5" because the inside of the flue is barely 6.5" and I don't want to chance buying a 6" and not being able to get it down. The chimney is nearl 30 feet so draft should be fine. Has anyone had any experience with Flex King 316Ti liner and kits? They seem to be the best price I've found.