KLIMAGIEL stiffening rings are used to keep the circular fabric channel in shape when it is not in use. During the construction phase, special pockets are sewn inside the channel which will house the stiffening rods made of fibreglass reinforced with glass fibre. The profile, therefore, is made of a light and particularly resistant material, thus making the final product of high quality. Since the processing is carried out on the inside of the channel, once this is straightened it will have a completely smooth aesthetic appearance. The final product is presented in the KLIMAGIEL aeraulic duct light, safe and ready for installation which will keep its round shape even when the air conditioning machinery is switched off.