The flexible duct connector is mainly used for the flexible transitional connection between the fans, ducts and ventilation equipment in the ventilation system.So it can also be called HVAC flexible duct connector.It has the functions of shock absorption and noise reduction. It can absorb the vibrations generated by the fan operation, preventing the vibrations from being transmitted and diffused along the duct, thereby reducing the noise during the equipment operation.The flexible duct connector can also counteract the thermal expansion and contraction of the pipeline, as well as the displacement deviations caused by installation misalignment and equipment vibration, and prevent the pipeline from tearing or deforming.
The flexible duct connector play a crucial role in ventilation systems. So, how can you choose a flexible duct connector that is suitable for the working environment and has a good cost-performance ratio?
1.Choose according to the material：
The materials for flexible duct connector include PVC, PU, and silicone. For PVC canvas material, choose one with thick and elastic base fabric. If it is too thin, the resulting flex duct connector will coil into a spiral shape. The base fabric should be made of cotton. If it is made of polyester, although the finished product looks bright, it is not fireproof in reality. After years of material selection, Company A has selected a type of PVC that is most suitable for fireproof flexible joints. Whether in terms of strength, anti-aging, or fire resistance performance, it has received high praise from users.
Let’s talk about PU Canvas material.It is made with fiberglass cloth as the base fabric, and then coated with polyurethane material.This PU coated fiberglass cloth is hard in texture and has a tough surface, making it very easy to cut. It also has waterproof and anti-aging properties.
About silicone canvas material,It is made with fiberglass cloth as the base fabric and coated with silicone material.The heat resistance of silicone coated fiberglass cloth is very good. Under the ventilation system, the quality of silicone coated fiberglass fabric is the best. Of course, it is also the most expensive. Silicone fiberglass fabric has the properties of fire resistance, fire prevention and high temperature resistance. Its anti-aging and wind pressure resistance properties are also very good.
2.Choose based on temperature resistance:
The flexible duct connector can be made of different materials depending on the temperature resistance. For a working environment around 70℃, PVC canvas can be chosen; for a working environment around 70℃, PU canvas can be selected; and for a working environment around 280℃, silicone canvas can be chosen.
3.Different types of fans can be made of different materials:
The fresh air system and air conditioning fans can be equipped with PVC flexible duct connectors and PU duct canvas connectors. The exhaust fan for cooking fumes can be fitted with thickened silicone flexible duct connector. Due to the high wind pressure of the exhaust fan for cooking fumes, thickened 1.0 silicone cloth can be used. The wind pressure can withstand up to 3000 pa, and it has good anti-aging and high-temperature resistance properties.
4.Choose according to the specifications:
The selection of the flexible duct connector usually depends on the flange. If the corner steel flange is used for the ventilation duct, the width of the iron sheet should be 40mm. If the common plate flange is used, the width of the iron sheet should be 75mm. The total width is determined by the distance between the ducts. There are 40-75-40mm, 40-100-40mm, 75-100-75mm, and 75-150-75mm. The specific size will be customized according to your requirements.
If you choose a flexible duct connector , you need to consider its temperature resistance according to the working conditions, as well as the fan’s power and pressure. The final size depends on your installation method. After all this explanation, do you now know which one to choose?
