The Ultimate Buyer's Guide for Purchasing Pre Insulated Duct Panel

26 May.,2025

 

Insulated Flexible Duct, Ventilation Ducting Manufacturer and Supplier

As one of the best Insulated Flexible Duct suppliers, Biyang has been providing different kinds of excellent Insulated Flexible Ducts for more than 10 years.  They are exported to dozens of countries all over the world, such as USA, Canada, Japan, Germany, Spain, Australia and so on.

If you want to learn more, please visit our website Langfang Clear Chemical.

Biyang Insulated Flexible Duct, also named Insulated Flex Duct,  is a kind of pre-insulated duct.  Biyang’s standard Insulated Flexible Duct is Insulated Aluminum Flex Duct, with aluminum silver sleeve outside, the insulation layer in the middle and Aluminum Flexible Duct inside.  This is the most common insulated duct in the HVAC ductwork.

Besides the standard one, Biyang provides different sleeves based on various working conditions, such as PVC sleeve, combined PVC, PE sleeve, VMPET sleeve(for better reflection and insulation), and so on.  There are also options for the inner duct, such as transparent PET, and Semi Rigid Aluminum Duct.

For Insulated Flexible Duct, the insulation is a critical part for the function of a whole product.  As a rich experience Insulated Flexible Duct manufacturer, Biyang provides several insulations for your selections, including common yellow glass fiber, red Owens Corning insulation with better elastic and density features, and white non has woven fabric insulation which is more environmentally friendly and with better noise and vibration absorbing effect.  All kinds of insulation standards are available here also.

Biyang provides options for common R6, R4.2 insulation standards, and many custom standards.  For example, R4.2 has about 30% less insulation but more competitive prices.  Anti-bacterial is also an additional feature for selecting.  Insulated Flexible Duct with anti-bacterial features helps maintain the health and green air of your ventilation system.

Inside the insulation, it is the flexible inner core with corrosion resistant galvanized or stainless steel wires.  The overall structure makes the Biyang Insulated Flexible Duct, non-combustible, fire resistant and good thermal performances.

Biyang Insulated Flexible Duct is made based on fire resistant and self-extinguishing standard, with AS/NZS.3 Australia fire rating testing approved. You are more than welcomed to share your problems and questions.  Biyang will help you out.

With a large amount of insulated ducting supplies every year, Biyang Insulated Flexible Duct is distinguished from others for the quality consistency, short lead time and competitive prices.  Our most popular items are 4-inch Insulated Flexible Duct, 8-inch Insulated Flexible Duct, and 12 inches Insulated Flexible Duct.

Please contact us now for quoting.

Insulated Flexible Duct: The Ultimate FAQ Guide

1. What is an Insulated Flexible Duct?

Insulated flexible duct is an integral part of air conditioning systems for connecting cooling and heating air distribution systems.

It consists of registers and grills that you can mount in places such as commercial building roofs, ceilings, or walls.

 Insulated flexible duct

2. What is the Use of Insulated Flexible Duct?

You can use the insulated flexible duct to attach supply air outlets to ductwork that is more rigid such as sheet metal ducts.

Implying that you will use it for supplying of air, returning air and transporting of exhaust air.

It has an insulation that will protect you from the adverse effects of the air passing through by preventing leakages.

It maintains very good quality of air, increases comfort, and reduces costly inefficiencies.

3. Where Can you Use Insulated Flexible Duct?

There are a number of industries where you can use the insulated flexible duct.

You will use them where heaters, air conditioners, and ventilation applications exist among them being:

  • Commercial buildings especially in extreme climates
  • Factories to provide proper air distribution through proper ventilation
  • Food industry especially the kitchen to help regulate the air conditions amidst the kitchen heat.
  • Agricultural industry for maintaining agricultural produce and farm inputs in stores at proper conditions.
  • HVAC industry for supply of air

4. What is the Best Material for Insulated Flexible Duct?

The best material for making standard insulated flexible duct is aluminum.

You are most likely to come across aluminum insulated flexible ducts with aluminum silver sleeves.

It has insulation layer between the layers but you will definitely find an aluminum flexible duct on the inside.

Apart from aluminum, you will find other types insulated flexible ducts with different materials such as:

  • PVC sleeves
  • Combined PVC
  • PE sleeves
  • VMPET sleeves which offer better insulation and reflection

The inner duct has options such as semi rigid aluminum duct and transparent PET.

5. How do R6 and R8 Insulated Flexible Duct Compare? Which is better?

Every insulated flexible duct has an R rating that indicates its insulating capacity.

R8 provides more insulation to the flexible duct in comparison to the R6.

The higher the R value rating the better the insulation capability and the higher the cost.

Implying that R8 is more expensive in comparison to R6 thus the better option among the two.

6. Is there Maximum Length for Insulated Flexible Duct?

Yes, there is a maximum length that you can get for insulated flexible ducts but this will depend on the manufacturer.

The most common standard length for insulated flexible ducts is 10 meters.

7. How Does Insulated and Non-Insulated Flexible Duct Compare?

Insulated flexible duct

Insulated flexible ducts are capable of preventing any leakages from the material thus keeping the heat within the flexible duct.

Non-insulated flexible ducts do not prevent the leakage of heat into the environment thus affecting the surrounding environment.

It is proper to have an insulation because it prevents energy wastage, temperature drops.

Leakages and buildup of condensation.

8. How are Insulated Flexible Ducts Classified?

You can classify insulated flexible ducts by looking at the functionality of the insulated flexible duct.

The classification is in two categories which include air connectors or air ducts.

9. What Should You Consider when Buying Insulated Flexible Duct?

Whenever you are purchasing an insulated flexible duct, you should consider the following:

  • Insulation rating of the insulated flexible duct by looking at the R rating
  • Anti-bacterial nature of the insulated flexible duct to help in maintenance of proper health standards
  • Corrosion resistance of the material of the flexible inner core which can either be stainless steel or galvanized.
  • Resistance to fire
  • Thermal performance
  • Flexibility of the duct.
  • Type of material of the insulated flexible duct.

10. How Long will Insulated Flexible Duct Last?

You can use an insulated flexible duct for a period of between 20 to 25 years.

You will experience deterioration of the insulated flexible duct after using it for more than 15 years.

11. Can Insulated Flexible Duct Withstand Long Exposure to Sunlight or UV Light?

Yes, insulated flexible ducts have special features that can withstand long exposure to UV and sunlight.

12. Are Insulated Flexible Duct UL Rated?

Yes, insulated flexible ducts are UL rated among other key ratings to ensure very high quality.

13. What is “certified R-Value” Insulated Flexible Duct?

Yes, there are certified R values for insulated flexible ducts.

In the past, different manufacturers had their own R values which could cause a confusion.

To avoid the confusion, a common ground for certified R values was introduced and every manufacturer has to adhere to.

14. Are there Recommended R-Values for Insulated Flexible Duct?

The certified R-value for insulated flexible ducts is R 6 which offers proper insulation up to 200 degrees.

You can, however, opt for a higher R rating that has better insulation properties but that will cost you more.

15. Should you Use UL-listed Mastics, Duct Tape, and Clamps with Insulated Flexible Duct?

Yes, you should use UL-listed mastics, duct tapes, and clamps with insulated flexible ducts.

For more Pre Insulated Duct Panelinformation, please contact us. We will provide professional answers.

This will ensure that you are using products of high quality that will not cause unnecessary problems.

16. What is ADC’s Requirements for Insulated Flexible Duct?

Yes, there are ADC’s requirements for insulated flexible ducts.

ADC sets forth the standards for specific classification, marking, testing, and installation methods of insulated flexible ducts.

17. How do you Support Insulated Flexible Duct?

You can support insulated flexible ducts by using different accessories such as:

  • Saddles or straps depending on the manufacturers specifications
  • Remember to space it properly in an attempt to ensure minimal sagging of the insulated flexible duct.
  • You should place supports at every connection point between the rigid metal duct and the flex duct.
  • You will support the vertically installed ducts at a minimum of every 6 feet.

18. How do you Size Insulated Flexible Duct?

You will size insulated flexible ducts by looking at the following key properties:

DimensionsInsulated Flexible DuctSize2 to 25 inchesStandard Length10 metersCompression Rate1: 10

19. Are there Plenum Rated Insulated Flexible Duct?

Yes, there are plenum rated insulated flexible ducts.

Plenum ratings ensure that the insulated flexible ducts have low flame and low smoke characteristics.

20. What is Pre-Insulated Duct?

Pre-insulated ducts are ducts that come complete with its insulation in place.

It enables single operation construction of HVAC ducts thus eliminating the need for metal duct work.

21. How much Does Biyang Insulated Flexible Duct Cost?

The cost of Biyang insulated flexible ducts will vary according to the type of insulated duct that you desire.

It will vary in terms of diameter, R rating, length and flame redundancy among other key specifications.

22. What Types of Insulated Flexible Ducts do Biyang Offer?

Biyang offers different types of insulated flexible ducts depending on the following technical specifications:

  • Dimensions in terms of length in meters and size of the diameter in inches
  • Material which can either be aluminum or any product of your choice
  • Insulation material which can be fiber glass, white rich woven fabric, and red Owens corning among others.
  • Types of sleeves such as aluminum sliver sleeves

23. Biyang Insulated Flexible Ducts come in How Many Sizes?

Biyang insulated flexible ducts come in different sizes depending on your requirements.

You can, however, order insulated flexible ducts up to a maximum of 25 inches.

24. Are Biyang Insulated Flexible Duct Tested for Mold Growth and Humidity?

Yes, Biyang insulated flexible ducts have to undergo mold growth and humidity testing.

This will ensure that the products are safe for you to use over a long period.

25. What are the popular sizes of insulated flexible duct?

The most common sizes that you will notice many people asking for are:

  • 4 inch insulated flexible ducts
  • 8 inch insulated flexible ducts
  • 12 inch insulated flexible ducts.

26. What are the common insulation materials for the insulated flexible duct?

You can decide to use different types of insulation materials among them being:

  • Yellow glass fiber
  • Red Owens Corning insulation with proper density and elastic features
  • White rich with woven fabric insulations which is more friendly to the environment.

Buying duct insulation online | Glass Mineral Wool Insulation

Your ductwork or duct system helps circulate air throughout the building. It needs to be insulated to ensure that the air you receive in your home is warm enough to keep your indoors comfortable. It also makes your home more energy efficient. Buying duct insulation online can also help you offset your carbon, as you do not have to travel to the local store to buy the insulation yourself. 

Ductwork or ducting system transports conditioned air throughout a structure. They are the channels via which cooled air from the air conditioner circulates and stale air is eliminated.

What are the common problems faced if your ductwork is not insulated? 

When the duct system is left uninsulated in your office space or at home, it leads to ventilation issues. Unhealthy ventilation can cause more sick days and absences from work, as well as poorer productivity. Other issues, that may develop due to lack of duct insulation include:

  • Uncomfortable indoors both at home and workplace. 
  • Leaking of conditioned air becomes quite common. 
  • Decrease the service life of the ductwork itself. 
  • Lower energy efficiency.
  • Greater heating costs.
  • Insufficient airflow.

Duct insulation has many benefits like:

With ductwork insulation, you not only save on energy costs and reduce heat loss but also reduce your carbon footprint and make your building more energy efficient.

In short, you reverse all the effects of uninsulated ductwork plus, enjoy other benefits including.

  • Quieter workplace as duct insulation reduces the operation sound of the ductwork. 
  • It improves indoor air quality.
  • Good ventilation.

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What are the different types of materials used for duct insulation?

There are numerous solutions available on the market, each of which serves a distinct purpose. You may choose an option depending on requirements such as acoustic insulation, heat loss reduction, moisture and condensation control.

1. Glass mineral wool insulation isover aluminium faced mineral wool insulation:

Fibreglass or glass mineral wool insulation provides excellent thermal and acoustic insulation to ductwork. It also provides exceptional fire resistance. Duct wraps made of mineral wool from Isover, enable a neat finish around ductwork.  

They are flexible, lightweight rolls that are easy to install. A factory-applied aluminium foil front provides an inherent vapour barrier to this durable, glass mineral wool roll. The thermal insulation of the Isover climcover helps to avoid thermal losses and condensation. 

Ideally, they are used to insulate both oval ductworks inside and outside the building. When used outside the building, an additional cover may be required.  

Benefits :

  • Significantly reduces heat loss in and around ducts.
  • Provides acoustic insulation
  • Fire resistance.
  • It ensures a tidy finish around the ductwork.
  • Prevents condensation issues around ductwork

2. Mineral wool or stone wool duct insulation slabs:

They are non-combustible insulation slabs with factory-applied foil-facing to provide water vapour resistance throughout the ductwork. We offer duct insulation slabs from some of the best brands like Knauf and Rockwool

Thermo-teK BD 060 Alu offers exceptional thermal, acoustic insulation to rectangular and square ductwork. It also provides excellent fire resistance, along with water vapour resistance. It is specially designed to tolerate extreme weather conditions and can be used to insulate ductwork outside the building. 

It can resist high pressure and does not lose form with time. It enables technical maintenance on solar panels, air conditioning units. 

Benefits :

  • Ideally suited to insulate rectangular ductwork.
  • Ensures that the duct system is thermally efficient and soundproof. 
  • Quieter indoors.
  • Resistant to fire and water vapour.

Rockwool Ductslab is flexible, lightweight insulation, perfect for rectangular ductwork. The easy to install insulation offers excellent thermal insulation. It has a reinforced aluminium foil face which provides good quality vapour resistance. This solution is non-combustible and acoustically absorbent according to the A1 classification.

With a service temperature of up to 230°C, it is ideal for commercial and industrial applications. It makes the workplace quieter and more comfortable. It is used to insulate H&V systems, cold water storage, feed, and expansion tanks. Air conditioning, warm air, and extractor ducts, in plant rooms, boiler rooms, or outside are frequently insulated with Rockwool mineral wool duct insulation thermal insulation solutions. It is also used to provide thermal insulation and reduce the operational sound of ducts that carry fluids, gases, or particle solids at high velocities. 

Benefits : 

  • Perfect to insulate rectangular ductwork.
  • Service temperature is as high as 230°C.
  • Can be used for industrial and external applications 
  • It enables a quieter workspace.
  • Saves energy cost and soundproofs duct system.

3. Thermaduct insulation: kingspan aluminium faced thermaduct insulation boards:

Manufactured with a high-performance rigid thermoset polyisocyanurate (PIR) core, the thermaduct solution from Kingspan is ideal for rectangular, circular and flat oval ductwork insulation. It is also used to provide HVAC insulation, other building solutions. 

Thermaduct insulation boards are versatile and can be used across projects as new builds or refurbishment works. They are used in residential, industrial and commercial applications. They provide a cleaner, more precise fit than non-rigid glass or rock mineral fibre duct wrap. 

Benefits :

  • It has a high performing PIR core.
  • It is a perfect solution for insulating rectangular, circular and flat oval ductworks.
  • Aluminium facings ensure water vapour resistivity.
  • Enables a cleaner, more precise fit. 

4. Phenolic duct insulation: kingspan aluminium faced phenolic insulation board:

Phenolic duct insulation from Kingspanis thin and efficient insulation, manufactured with a rigid thermoset phenolic insulating core. It is designed for use on rectangular, circular, and flat oval ductwork. It offers high thermal insulation and fire resistance. 

Kingspan Phenolic Insulation Boards are suitable for a wide range of duct sizes and insulation requirements. At sites where ductwork supports and hangers are installed, they can withstand the loads produced by HVAC / building services ductwork. They are suitable for both indoor and outdoor applications, HVAC and building applications, plenums, and associated equipment.

Benefits :

  • It offers excellent thermal insulation and fire resistance.
  • Suitable for both external and internal applications.
  • It is an ideal solution for rectangular, circular and flat oval ductwork insulation.

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In conclusion:

As mentioned earlier, insulating your duct system can include many benefits for your home and your health. With the information provided in this blog, you can, hopefully, make an informed decision about the duct insulating material that would best suit your requirements. 

For quality duct insulation products, visit us at https://www.buyinsulationonline.co.uk/. We offer free delivery on select postcodes for all technical insulation products. We also have a massive range of loft insulation, APR, wall insulation, pipe insulation products, and so much more at the lowest possible prices, all from the best brands in the UK. Hurry and get a limited 5% off on your very first order!

For more information, please visit Steel And Timber Frame Phenolic Boards.