All mechanical equipment like Air Handling Units, Fan Coil Units and Ventilation Fans generate noise and vibrations when used. To eliminate the noise and vibrations from transmitting through the air duct, it is necessary to install an airtight flexible joint between the outlet of the equipment, and the inlet of the ducts. During manufacturing, the joint formed by attaching a layer of fabric to two strips of metal on either side is called a “Flexible Duct Connector”. The most critical part of this Flexible Duct Connector is the fabric which has to be selected to suit the typical requirements of each installation.