Close this search box.

Flexible Duct Connector

Flexible Duct Connector

SuperAir Flexible Duct Connector is one of the types of duct fittings to address the vibration and noise issues caused by the fans, blowers, and other equipment used within the ventilation systems. SuperAir Flexible Duct Connector comprises Canvas Duct Connector, Polyester Duct Connector ( also known as PVC Duct Connector), and Glass Fiber Duct Connector.

The Leak-Proof Ductors can be used in various situations, Including Hoting or High-Temperator Zones, to Ease The Noise Privem. As the top fire Xible DUCT Connector Provider, SuperAir Has Several Kinds of Products. Canvas Duct Connector, OR Canvas Flexible Duct Connector, is the most popular and price-competitive Flexible Duct Connector constructed of galvanized steel and canvas material. It can be utilized in the average temperature range.

Galvanized sheet of steel  is rust-resistant and easily connected to the metal conduit. Canvas fabric is soft but robust, which makes the connector pliable but robust. This combination makes the ideal option for your Air duct connector that is flexible, as well as your HVAC duct connector that is flexible. At a very affordable price, SuperAir Canvas Duct Connector will solve your issue for most typical environmental applications.

Polyester Duct Connector is SuperAir most renowned Flexible Duct Connector. First, Polyester Duct Connector is fire-resistant and may be used as a fire-certified Flexible Duct Connector. SuperAir Flexible Duct connector made of polyester can work between 30-120 range.

Second, Polyester Duct Connector  is more resistant than Canvas, with 3000x2090N tensile strength and 288.5×246.6N anti-rip strength. In addition, it’s an ideal balance between price and characteristics. This is the reason why the majority of customers are delighted with the SuperAir Polyester Duct Connector.

Glass fiber Duct connector   is SuperAir top-quality product known as High-Temperature Flexible Duct Connector. The SuperAir Flexible Duct Connector offers the top features in heat resistance and durability.

It can support the -30-280 range, 2300x1860N tensile force, and 253.6×180.5N anti-rip strength. SuperAir Glass Fiber Duct Connector is the most suitable option in a rough and tough setting.

SuperAir Flex Duct Connectors are available in all standard sizes needed for the HVAC system. They are offered in lengths of 25m, 30m, 45m, and 50m. Of course, custom lengths are also available per your specific request.

SuperAir Flexible Duct Connectors are easy to cut into small pieces without complex tools before assembling. If you are cutting them, SuperAir suggests that you determine the size of the connection of the fan or blower and add another 2.5-4cm length.

In addition, SuperAir provides two methods for flexible duct connection details. The first is to glue the overlap area. Naturally, the glue must be robust. Another choice is to utilize a specialized staple to secure the two parts of the overlap.

One of the most skilled Flexible Duct Connector manufacturers from China, SuperAir has kept innovating new products that can be used for different purposes, including round flexible duct connectors, rectangular duct connectors, Flexible plenum connectors, Neoprene flexible duct connectors to meet your various demands.

If you have questions or concerns, you can write us a message to address your flexible ductwork connector issues.


What is a Flexible Duct Connector?

Flexible duct connector

A flexible Duct Connector is a ductwork fitting that can reduce noises and vibrations for industrial and residential purposes and provide thermal insulation.

Air ducts for all HVAC units are connected to mechanical devices with an air blower or fan.

The sounds, rattles, or vibrations generated by the fan or blower action are transmitted to the metal ducts, which transmit the sound throughout the system. Install an adjustable duct connector between the device and the ductwork to block the sound and vibrations from the source.

The connector for ducts is a pliable air-tight connection made of fabric, which is bonded to sheet metal at both ends.

flexible duct connector
flexible duct connector

Parts of duct connectors that are flexible

The fabric for making flexible duct connectors could include, for instance, glass fibers with polyurethane or polyester with PVC coating. It is connected to sheet metal at both ends. The materials used to create the sheet metal could be galvanized or s stainless steel.

Are Flexible Duct Connectors UL Classified?

Underwriters Laboratories, Inc. thoroughly tests and classify flexible duct connectors that comply with the UL 181 standard. Flexible duct connectors must pass the twelve tests included in the standard. You can tell UL verified and classified flexible duct conn ectors with the UL mark that appears on the connectors.

Where are Flexible Duct Connectors Used?

Flexible connectors to ducts are manufactured in various sizes and thicknesses for commercial, light commercial, residential, commercial, and industrial applications.

Mechanical equipment like fan coils, ventilation fan units, and air handling systems create sound and vibrations when in operation.

Typically, you’ll see flexible duct connectors near any ventilation device, which could produce noise and vibration. When you install these flex-duct connectors, you need to pull them up but be cautious of being too tight. A closed connector will hinder airflow  and can be ineffective in fulfilling its primary function of reducing noises and vibrations.

Why use Flexible Duct Connector in HVAC Systems?

Flexible duct fittings can connect the appliance and ducts to block out vibrations and noises within an HVAC system of ductwork. They allow the rapid development of flexibility joints that stop any transmission of vibrio among the HVAC equipment and the related ductwork.

The installation of the flexible connector for ducts is typically in between the outlets of the device and the ducts’ inlet. Contrary to complicated ducts, flexible connectors also allow an offset of just a little between components of HVAC and the.

What is the Best Seam for Flexible Duct Connector?

Double-fold offset seams provide the highest durability and tear-resistant fabric, holding power while adding structural stiffness. However, it can cut and performs its function.

This type of connection guarantees an air-tight seal that is hard to destroy when constructing the connector for ducts into its final form.

Double-folded offset seams provide structural stability to the duct connector’s flex. This means the likelihood of failure resulting from problems with or under pressure is extremely slim.

How do You Specify Flexible Duct Connectors?

It is essential to provide the correct specification for Flexible duct connectors to ensure that you have the proper device for HVAC systems.

flexible duct connector
flexible duct connector


Which Fabrics Are Used in Flexible Duct Connectors?

The central part of the flexible connector for ducts is the material you select to meet the requirements of every HVAC installation.

The following types of fabrics are available to pick from:


Vinyl is the best option for the flexible duct connector for HVAC systems requiring an affordable and flexible connection. It is the most commonly used fabric for all ductwork installations, particularly residential ones, due to its resistance to abrasion and muscular tear strength th th.

Vinyl is the most elastic duct connector fabric suitable for watertight, air-tight, and low or medium-pressure ductwork systems.

Neoprene BS

Flexible duct connectors with Neoprene fabric are ideal for mechanical solid strength applications. Neoprene fabric is highly resistant to most chemicals, alkalis, and gasoline.


Silicon-based fabrics have a unique silicon rubber layer with remarkable resistance to high and low temperatures. This type of fabric does not ignite and emits minimal fumes when exposed to the flame of an open source.

Flexible duct connectors with silicon fabric are highly suitable for projects where high temperatures are the main focus for indoor and outdoor HVAC installation.


Flexible duct connectors made of Hypalon Fabric are the best choice for roof areas or those exposed to direct sunlight. They can be used for a variety of outdoor uses.

Ultraviolet radiations don’t affect Hypalon fabric.

Thus, you can place flexible duct connectors made of it near UV radiation filtration systems as well as electrostatic air cleaners with complete confidence.

Hypalon is more porous than Neoprene, has excellent aging properties, a moderately more extensive operating temperature range, and is resistant to various chemicals.


Also known as a PUL fabric, it is water-resistant, typically polyester, but it could be a poly-mix or cotton fabric that undergoes heat lamination to create a polyurethane layer.

This duct connector fabric is highly durable and lightweight. Being flexible and straightforward to work with makes polyurethane ideal for flexible duct connectors. Additionally, for the highest abrasion resistance, It is possible to create PULL air-tight fabrics, which will with stand humidity, fire-retardant, and water.

Although they are fragile in their construction, the flexible connectors for ducts made of polyurethane fabrics have a more significant time to withstand temperatures above.


The standard option in general cooling and ventilation projects and for applications in air-tight and waterproof constructions both indoors and outdoors.

flexible duct connector
flexible duct connector

Benefits of Using Flexible Duct Connectors

Extended HVAC System Lifespan

By stopping vibrations from reaching delicate components, Flexible duct connectors can aid in the longevity of HVAC systems—less wear and tear results in lower maintenance costs and more incredible equipment life.

Improved Indoor Air Quality

The air quality inside is essential for the resident’s health and well-being. Flexible duct connectors help prevent the spread of harmful substances by ensuring their integrity in the ductwork, ensuring that only clean, filtering air circulates.

Energy Efficiency Boost

Efficiency is an essential component of modern HVAC. The system can operate more efficiently with flexible duct connectors by limiting the loss of air and temperature fluctuations. This means less energy usage and lower costs for utilities.

Applications of Flexible Duct Connectors

Commercial Buildings

HVAC systems work tirelessly in commercial areas with large spaces to ensure the environment is in good order. Flexible connectors for ducts play an essential function in ensuring that these systems operate smoothly, quietly, and long-lastingly, which makes them a significant asset in commercial facilities.

Residential Spaces

From single-family homes to apartments, flexible duct connectors increase residents’ comfort by creating a quiet and comfortable indoor space. They are essential in ensuring an HVAC system functions smoothly without affecting daily activities.

Industrial Facilities

Industrial environments often require robust HVAC solutions. Flexible duct connectors provide industrial facilities with the capability to increase productivity while not hindering the comfort of employees. They absorb vibrations and offer a quieter, safer, and more secure environment.

Choosing the Right Flexible Duct Connector

Material Considerations

Flexible duct connectors can be found in various materials, each having distinct advantages. Considerations like temperature resistance, chemical compatibility, and endurance will determine your material selection.

Size and Compatibility

The right size and kind of flexible duct connector are crucial for a successful performance. Proper sizing will ensure a secure fit that prevents air leakage and increases the efficiency of the connector.

Installation and Maintenance

Proper Installation Techniques

A proper installation is essential to ensure maximum performance. A professional installation will ensure that the flexible duct connectors are placed correctly, effectively absorb vibrations, and stop transmitting noise.

Maintenance Best Practices

Flexible duct connectors need little maintenance; regular inspections are suggested to ensure they are in top condition. Regular inspections to check for tear, wear, and damage can stop issues from becoming more severe.

Addressing Common Misconceptions

Not Just an Acoustic Solution

Although their benefits for acoustics are well-known, flexible duct connections have several advantages beyond noise reduction. Their effect on the longevity of systems and energy efficiency is essential.

Not a One-Size-Fits-All Solution

Each HVAC system is different. Flexible duct connectors are available in a variety of sizes and types to meet a variety of needs. A custom-designed system will ensure that your system has the advantages that it demands.

Flexibility in Design and Function

Adaptable to Various Configurations

HVAC systems come in different layouts. Flexible duct connectors can be adapted to seamlessly match these configurations, providing top performance regardless of system design.

Impact on Airflow Distribution

The proper airflow distribution is crucial to ensure you have a consistent level of comfort. Flexible duct connectors aid in ensuring that airflow is balanced, keeping cold or hot spots in a room.

Examining Flexible Duct Connectors to Alternatives

Rigid Connectors, as opposed to. Flexible Connectors

Flexible connectors can’t absorb the vibrations efficiently, making them unsuitable to reduce noise and vibration isolation. Flexible duct connectors, however, excel in these areas.

Flexible Ducts in comparison to. Flexible Connectors

Although they sound alike, flexible ducts and flexible connectors for vents have different functions. Flexible ducts carry air, while flexible connectors improve the performance of a system by damping the sound and vibrations and reducing noise.

Industry Standards and Regulations

The building code complies with the Building Codes.

Flexible duct connectors have to conform to building codes. Conformity ensures that the parts comply with safety, fire, and efficiency requirements, giving peace of mind to users and designers.

Safety and Fire Ratings

Safety in a fire is a top priority for any construction. Flexible duct connectors typically come with fire-resistant characteristics, reducing the chance of fire extending through ductwork and improving general safety in the building.

Flex Duct Connectors: Future Trends

Technological Innovations

As technology advances, Flexible duct connectors will likely include new designs and materials that improve efficiency and make them more important in HVAC systems.

Sustainability Measures

With the increasing emphasis on sustainability and environmental protection, Flexible duct connectors may use eco-friendly materials and manufacturing processes that align with the overall objective of decreasing carbon footprints.

Enhancing HVAC Performance by Using Flex Duct Connectors

Seamless Airflow

The smoother the airflow, the more efficient and effective the HVAC system. Flexible duct connectors guarantee smooth airflow, which reduces turbulence and pressure drops that can impact the performance.

Minimized Air Leakage

Air leakage compromises energy efficiency. By establishing a secure connection between the ductwork and the equipment, Flexible duct connectors can help reduce air leakage, thereby improving the system’s overall efficiency.

Can Flexible Duct Connectors Prevent Noise and Vibration Transmission?

The primary purpose of flexible duct connectors is to transmit sound and vibrations between the ductwork and the HVAC equipment.

In an HVAC system, machines that rotate and move air and fluid through the ducts and pipes generally create the loudest sounds. The movement causes the sound of vibrations, sounds, or even noises that you can quickly isolate by using flexible connectors for ducts.

It is also possible to reduce the sound, vibrations, and noise by ensuring a proper HVAC system design. This includes:

  • Choose a suitable duct silencer The best choice is a silencer that does not add static pressure to the fan. Loss of static tension equal to or below 0.35 inches substantially reduces the noise level.
  • Create an air distribution scheme to minimize turbulence and resistance to flow. If there is a lot of resistance to air, you’ll require high pressure for the fan. This can increase fan noise, especially when the frequencies are low.
  • Airflow in areas: that are susceptible to sound should be quiet. It is possible to achieve this by extending the dimensions of the duct system, which will lower the noise and turbulence caused by airflow.
  • Reduce the usage of volume dampers near grilles, registers, and diffusers in critical acoustical circumstances.
  • Duct transitions should not be more than 15 degrees. This includes expansion angel failure, failing which the system is loud.
  • Reduce the noise of using elbows or takeoffs for duct branches whenever you can by placing them at a minimum of 4-5 duct diameters from one another.

What are the Different Configurations of Flexible Duct Connectors?

Flexible duct connectors can be found in various configurations.

Let’s examine the  two most common designs  of flex duct connectors.

 Rectangular Flexible Duct Connectors

Connectors for flex ducts that are rectangular can be used to create fabric compensators.

They aid in preventing the transmission of vibrations within the ductwork in rectangular shapes and are suitable for Acoustic decoupling. So, a rectangular flex duct connector typically connects between devices, fans, or fans, as well as rectangular HVAC ducts.

 Circular Flexible Duct Connectors

This duct connector is beneficial for connecting two spiral or plain ducts.

The primary function of connectors for circular ducts is to stop the transmission of noise and vibrations into this circular ducting system. This improves the acoustic quality of the ductwork.

They are available in different sizes and are also flame retardant, which improves their resistance to temperature.

What is the Best Flexible Duct Connector Material?

Neoprene is widely used in HVAC systems.

It’s a great alternative to other flexible duct connector materials.

Neoprene is widely used and is the most commonly specified flexible duct connector material since it maintains its age-related properties and flexibility over a long time.

The fabric is waterproof and air-tight, has outstanding aging properties, the ability to flex, and excellent burst strength. It is made of a base material of knitted fiberglass with an additional layer of polychloroprene.

Neoprene adaptable duct connections come with fabrics that run at both ends that are galvanized steel. Or, they might be available only as fabric-specific applications.

The fabric is ideal for any application that requires high mechanical strength. Neoprene is a good choice for high-pressure and high-speed ductwork systems. Additionally, it’s a good choice for situations where the accessory duct connector must come in contact with extreme environmental conditions or toxic fumes.

SuperAir HVAC Duct Fittings  cover every connection and transition fittings suitable to HVAC ductwork.

SuperAir  offers a range of specifications and products to fulfill the majority of the requirements of its customers.

In addition to flexible duct fittings, we also provide the following fittings for ducts:

  • Hose Clamps
  • Duct changes
  • Duct Elbow
  • Duct Reducer
  • Duct boot
  • Duct splitter
  • HVAC Saddle Tap
  • Line set cover


Q. Are flexible duct connectors compatible with all HVAC systems?

A. Flexible duct connectors are versatile and can be customized to fit various HVAC system configurations, making them compatible with various setups.

Q. Can flexible duct connectors eliminate noise from HVAC systems?

A. While flexible duct connectors significantly reduce noise transmission, complete elimination might require a combination of noise-reduction strategies.

Q. Do flexible duct connectors require regular maintenance?

A. While flexible duct connectors are low-maintenance, periodic inspections are recommended to identify wear and tear and ensure optimal performance.

Q. Are flexible duct connectors a fire hazard?

A. No, flexible duct connectors are often designed with fire-resistant materials, contributing to the overall fire safety of the HVAC system.

Q. Can flexible duct connectors help save energy?

A. Yes, flexible duct connectors contribute to energy savings and increased HVAC system efficiency by minimizing air leakage and optimizing airflow.


Contact us today   for the best prices on all  HVAC duct systems  .

At  SuperAir , We create and produce high-quality Flexible Duct Connector. 



Contact Us to Find More Products

Should you have any inquiries about HVAC, or get our latest catalogs, please leave a message below and we will contact you within 24 hours.

Ask For A Quick Quote

We will contact you within 1 working day, please pay attention to the email with the suffix “”