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 ducts, 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.
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Following fabric varieties are available
Vinyl is the most commonly used fabric for all air duct installations due to its high tear strength, and its high abrasion resistance. Vinyl is recommended for low to medium pressure duct work system.
2) Neoprene BS
Neoprene is recommended for use in application where high mechanical strength is required. Neoprene is extremely resistant to most alkalies, gasoline and toxic fumes.
Silicon fabric has a special silicon rubber coating that has excellent resistance to high and low temperatures. It is recommended for application where high temperature is of main concern in both indoor and outdoor installations.
Hypalon coated fabric has the best resistance to ozone layer, and is the first choice for outdoor applications. It has excellent resistance to weathering, acids and highly recommended for roof top applications.
Polyurethane fabric are fragile in construction but have a longer resistance period to high temperatures.
Traditional canvas cloth used for air conditioning and ventilating applications, indoors and outdoors.