I'm getting a ss liner for my chimney. From the top of my stove up thru chimney to the top it's 21 feet. I've looked at the liners and I see they come in 5 ft sections so 20 or 25 feet, and it's about $75 more for the 5 ft section.is it ok to run single wall stove pipe up for that one ft section and then hook to ss liner?