Review Walker (40000) 1 inch diameter - 25 feet Electroplated flexible hose. We were without electricity for a week after a winter storm on the estate. After seeing articles on the internet "How to lengthen your generator exhaust" I thought I would give this flexible exhaust a try. Previously, reviewers said the pipe was covered in smoking oil. Photo 1: The tube does not blink at 1102 degrees Fahrenheit. It's almost red. on the sidewalk to see the smoke from burning oil. The smoke isn't exhaust, it's hot oil. Have a fire extinguisher ready. Photo 3: Generator exhaust at the 25 foot end. At over 1000 degrees, a hot pipe could easily start a house and wildfire. Some people have suggested using silicone tubing, which breaks down into potentially toxic and flammable by-products at around 500 degrees. Good luck with it. This is a professional exhaust pipe that works well and can handle hot exhaust.