1. It has the advantages of large air volume, good ventilation, small wind resistance, etc., using canvas, coated cloth, fiberglass cloth and other fabrics, a variety of styles, round, square, rectangular, conical, tower 2, and distributed use with outdoor, oil pollution and other harsh environments, has good adaptability for anti-aging, anti-stretch, soft connection internal support wire skeleton, play a stable role The function of soft connection and stretching is convenient and quick, and the connection method Generally, there are two types. 3. One is clamp connection, which is suitable for circular ventilation duct soft connection, large contact amount, friction is not easy to fall off, and this kind of soft connection has flanging at the connection place during production, which is easier to fix, and the other is flange connection, various materials, carbon steel and stainless steel can be made, and all use imported laser cutting equipment. 4. Silicone cloth soft connection has a wide temperature range, high pressure resistance, strong corrosion resistance, good flame retardant performance, sound absorption and shock absorption, and good flexibility. 5. Compared with traditional metal bellows, it avoids the hard force transmission caused by the connection of metal parts, eliminates pipeline vibration, and solves the problem of compensation for thermal expansion and contraction of ventilators and the inevitable displacement of metal parts. It can also protect the fan in the event of an accident.