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Your ducting should be able to withstand constant flexing that will occur when you are installing your ducting. Make sure you find a flexible duct hose that is suited for air handling in a variety of situations. This will ensure that you have a quality product that can work for your needs. One product that you should consider is the Activair flexible ducting. This product is built extremely well to ensure you don’t have any ducting problems after it has been installed. It is manufactured from a tough colored fabric that is comprised of PVC coating. This ensures that the product is very durable and flexible when air is passing through plastic ducting . This product can withstand constant flexing pvc ducting  without any damage or kinking to the product. It is supplied in 6 meter lengths that will compress to one tenth of their full extension. This will ensure that you are able to fully transport the product. It can be easily cut with a sharp and knife and pliers if you are looking to shorten the distance of the ducting. If you are going to be installing a flexible air duct it is important that you always install the product fully extended. The hanging straps for your flexible duct should be at least 1 inch in width. This will ensure that it will have a proper fit. Also make sure the ducting  connections are adequately supported and cable ducting the joint isn’t bearing too much weight.