Wickelfalzrohr seal L-2004 mounted ducts, spiral ducts and fittings have the advantage of not only providing perfect insulation but also reducing noise and vibration levels generated by the ventilation system. The sealing profile "T" can be used for both fresh air supply systems and exhaust systems. Even if the exhaust air carries solid matter (wood chips, dust, etc.), it is no problem. The gasket is available in the form of an endless ring made to of length specified by the customer.