Easily extend the length of your existing AC Unit exhaust duct * Now you can use the AC unit where you need it. Extension hose supplied is flexible and strong and heat resistant upto 158 degrees F * Provides an extension to the existing hose. Designed with a wider diameter to accomodate the faster flow of air needed over the extended length * Easy to attach to existing hose with supplied duct tape and reduction ring adaptor Your existing hose should be at least 5 inches in diameter * Specially manufactured. High quality PVC Ducting with metal reinforcment.