You are taking your odds going to the fights, Specifically to see the heavies, whose bouts often past lower than a moment. Versions 0110DOW, 0120DOW, 0110GOW and 0120GOW are "outside of wall or floor" integral sleeve static curtain variety fireplace dampers.  Product 0110GOW and 0120GOW are especially created for source https://heavy-duty-stainless-stee91244.blogolize.com/everything-about-dampers-for-industrial-sector-76033233