Custom Ductwork Series

Do you know that your competitors are already using machine for ductwork?


Are you still cutting air ducts by hand tools? Do you agree it is time-consuming, costy on labour, material wasting? Do you know that your competitors are already using air duct cutting machine and be way ahead of you?
Pre-insulated duct has been used in the HVAC field for more than 20 years, and it is on the edge these few years. With a lot of advantage compared to traditional galvanized iron duct, PI duct has become a new favorite in the industry. PI duct is light-weight, damp-proof, easy to install and maintain, thermal effect self-contained. More and more contractors are choosing PI duct over GI duct in their ventilation projects.
At first, people use hand cutting tools to manufacture Pre-insulated duct, which cost a lot of time. Expert engineers, numerous cutting and assembly workers and time is needed to complete the whole production of PI duct. It requires less equipment than GI duct fabrication does, but still quite slow. But in recent years, CNC cutting machine designed for PI duct is born. Which totally brings the whole ducting production into a new era.
As a pioneer in HVAC field, our team noticed the great need of CNC machine for pre-insulated duct fabrication, we managed to design and continuously upgrade this great machine. It is a machine with most complete function for PI duct fabrication and a best help for large production.





With more and more clients placing orders with us, our brand and the machine also become famous in the world market. Our machine got appreciated by customers from American continents, European, Middle East, Southeast Asia, West Africa, etc. All the orders and good feedback from our customers show that we are doing the right thing.
Only in the past 9 months, our machines have been sold to Turks and Caicos Islands, Egypt, Israel, Saudi Arabia, Nigeria, Cambodia, Thailand, Mexico, Belgium, Anguilla, Malta, Kuwait, etc., among which a few customers are from the same area. As we know a lot of companies and groups are in serious competition especially in Middle East, South East Asia and West Africa. Some of the groups in your area might have bought a machine long ago, some might just placed an order.
It is a cruel fact that groups with machine will run ahead of groups without. Our machine can do all the jobs for from expert engineers designing the shapes to workers spending a lot of time cutting them out. A mature system will save you a lot of tough work during the whole production. The only thing left is to assemble the workpieces. It is a one time investment for machine. It may seem expensive at a glimpse, but think about all the cost on time, raw materials and labour it will save for you in the long term.
We believe if you have a machine, the competition from a same start can be more equivalent and it is also a great honor to see our customers using a good machine and to conquer the local market. Don’t hesitate to reach out and check more about the pre insulated duct cutting machine with VENTECH team for a high purpose of your air conditioning projects.





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5 Differences between round ducts and square ducts-Part One



Advantages of circular air ducts
Advantage 1: High air tightness. As we all know, no matter whether it is conveying gas or relying on gas for material transportation, the gas conveying pipeline is the most forbidden to leak. So, how does the round duct do this? It turns out that the pipe fittings of the round air duct and other parts connected to the duct have factory-assembled airtight joints. When installing, just insert them into the round duct to achieve a high degree of airtightness. According to the international CEN pipeline airtightness standard, it can reach Class C leakage level. The airtight joint is composed of two rubber sealing rings (see picture). When the joint is connected with the pipe fittings, the sealing ring is compressed and can withstand a positive pressure of 3000Pa and a negative pressure of 5000Pa, thereby ensuring the degree of airtightness. The circular straight pipe with spiral bite will not produce leakage. After using the sealed joint, the air leakage rate of the entire air duct system will be minimized. The leakage of the ventilation pipeline is caused by the connection of a large number of pipe fittings. Compared with the rectangular pipeline, the typical length of the round pipe is 3-6 meters, while the length of the rectangular air duct is only 1-1.5 meters. The gasket of the rectangular air duct is made by hand and installed roughly, it is impossible to be installed by the factory like the round pipe fittings. The circumference of the sealing part of the circular pipe fitting is relatively short. For the same section, the circumference of a rectangle with an aspect ratio of 1:3 is 41% longer than that of a circle, so the air leakage area is greatly reduced.
Advantage 2: Low installation cost Under the same resistance conditions, a rectangular pipeline of 250×250 mm can be replaced by a circular pipeline with a diameter of ∮ 200 mm in the same installation space, and its overall installation cost is lower than that of a rectangular pipeline by 50 %. Replacing one rectangular pipe with two or several circular pipes also reduces costs.

Have you ever heard about a HVAC PID duct cutting machine. A HVACE PID duct cutting machine is used to cut pre-insulated duct panels. HVAC PID duct cutting machine is a cnc machine, it’s computerized and automatic. I’d like to suggest you to buy a HVAC PID duct cutting machine for your ductwork fabrications. HVAC PID duct cutting machine is definitely something that will blow your mind！Easy to use, fast working ect... HVAC PID duct cutting machine is definitely your first choice!


Installation technical measures: on-site installation process
(1) When installing the air duct, first install the supports and hangers according to the design elevation of the air duct, arrange them in order, and number them. When hoisting, safety measures should be taken to prevent damage caused by collisions. The installation of the air duct should be carried out in accordance with the position of the equipment and the position of the tee, elbow, etc., and the sequence of the equipment connection pipe and then the main pipe; the vertical air pipe is generally installed from bottom to top.
(2) According to the center line of the air duct, find out where the suspenders are to be laid. The single suspenders are on the center line of the air duct; the double suspenders can be installed symmetrically according to the distance between the bolt holes of the supporting plate or the center line of the air duct, and the distance between the hangers is ≤ 4m. When the air duct is long, a row of hangers needs to be installed. The positions of the two ends can be determined first, and then based on the determined supports at both ends, use the pull wire to find the position of the middle support for installation. Fixing supports and hangers should also be added at appropriate positions to prevent swinging. (HVAC Nanshe)
(3) Reinforcement of the air duct: a. Reinforcement measures should be taken in the following cases: a.1 The diameter of the spiral air duct is greater than or equal to 800mm, and the length of the pipe section is greater than 1250mm or the total surface area is greater than 4m2. Reinforcement measures. b. The reinforcement of the air duct shall comply with the following regulations: b.1 The reinforcement of the air duct may be in the form of corrugated ribs, vertical bars, angle steel (inner and outer reinforcement), flat steel, reinforcement ribs and pipe inner supports, etc.
To be continued.



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What is Phenolic ductwork and its advantages?

Modified phenolic formaldehyde is made of non-woven fabric and phenolic formaldehyde through continuous compounding and compounding, and it is compounded and compounded. It is a material, the middle phenolic foam is guaranteed to be foamed and foamed, the density of the cells, the cells and the foaming density are even, flat, non-absorbent, light, and composited with color steel to make a color steel sandwich fermentation paste board.

Phenolic foam is known as the "King of Insulation". It was used in the insulation of missiles and rocket heads in the early days. It has become the fastest growing variety of plastics in some developed countries such as the United States, Britain, and Japan. Phenolic foam material has good flame retardancy, small thermal conductivity, excellent sound absorption performance and long service life. Due to the above superior characteristics, phenolic foam materials have been widely used in various aspects of the national economy, such as central air-conditioning ducts, hot and cold transmission pipes, clean workshops, shopping malls, light-weight quick-loading rooms, cold storage, refrigerated trucks, airplanes, Ships, hotels and entertainment boxes, etc. need to use fireproof, light weight, heat preservation, sound insulation, clean, moisture-proof materials.

Performance advantages of phenolic composite air duct
The traditional air supply duct of central air conditioner is usually made of iron sheet or fiberglass as the inner layer, wrapped with thermal insulation material, and wrapped with aluminum foil on the outside, which makes the air supply duct heavy in weight, labor-intensive and time-consuming in construction and installation, poor in appearance, low in air tightness, and low in energy consumption. big. Compared with traditional air ducts,

Phenolic ductwork has following good features:
1. Noise reduction.
The interlayer of the phenolic aluminum foil composite air duct wall is a porous phenolic foam material plate that penetrates each other, which has good noise reduction performance. In the central air-conditioning system, the noise generated by the air-conditioning unit during operation is in the range of 50-79dB, which is transmitted through the air supply pipe to form indoor noise. The phenolic aluminum foil composite air duct itself is a very good pipe muffler, and there is no need to set up muffler accessories such as muffler covers and muffler elbows.

2. Low thermal conductivity.
It can greatly reduce the heat dissipation loss of the air conditioner. The thermal conductivity of phenolic composite air duct is 0.016~0.036W/(m·k), while the thermal conductivity of galvanized steel air duct and glass fiber reinforced plastic air duct is much larger. In addition, the unique connection method of the phenolic composite air duct ensures the excellent air tightness of the ventilation system, which is close to 8 times that of the galvanized steel air duct. Some data show that when transporting the same amount of heat (cold), the heat dissipation loss of the galvanized steel air duct is 15%, the heat dissipation loss of the glass fiber reinforced plastic air duct is 8%, and the heat dissipation loss of the phenolic foam insulation material air duct is less than 2%.

3. Light in weight.
It it able to reduce building load, and easy to install with its light weight feature. The phenolic duct panel is light in weight, about 1.4 kg/㎡, while the density of galvanized steel air duct (0.8mm thick) and FRP air duct (3 mm thick) are 7.08 kg/㎡ and 15~20 kg/㎡ respectively. ㎡, which can greatly reduce the load of the building, and is extremely beneficial to the installation of air ducts. When installing, it only needs to set up a bracket every 4 m or so to have enough supporting force. This greatly reduces the requirements on the bearing capacity of brackets, hangers, etc., making transportation and installation very convenient. Using a phenolic duct making machine is the best choice to improve your Phenolic ductwork efficiency. Phenolic duct making machine is a cnc duct making machine used to make Phenolic ductworks. If you search for a phenolic duct making machine, please make sure that the phenolic duct making machine has a dedicated phenolic duct making software that is easy to use, and comes with a graphic gallery. Phenolic duct making machine with a phenolic duct making software is much more user-friendly.

4. Durable and long service life
Galvanized steel sheets are prone to rust in humid environments, while glass fiber reinforced plastics are prone to aging and damage. Therefore, the service life of traditional air ducts is not long, about 5 to 10 years. The insulation layer of traditional air ducts, such as glass wool The service life is only 5 years, while the service life of the phenolic aluminum foil composite air duct is at least 20 years. Therefore, the service life of the phenolic aluminum foil composite air duct is more than three times that of the traditional air duct. In addition, the reuse rate of phenolic aluminum foil composite air duct can reach 60%~80%, while the traditional air duct can hardly be reused.

5. Reduce layer height
Traditional air ducts require on-site insulation layer construction, so a certain construction height is required, which puts additional requirements on the building's storey height. The phenolic aluminum foil composite air duct does not require on-site insulation construction, so there is no need to reserve construction space, which can reduce the height of the building.

Using a phenolic duct making machine is the best choice to improve your Phenolic ductwork efficiency. Phenolic duct making machine is a cnc duct making machine used to make Phenolic ductworks. If you search for a phenolic duct making machine, please make sure that the phenolic duct making machine has a dedicated phenolic duct making software that is easy to use, and comes with a graphic gallery. Phenolic duct making machine with a phenolic duct making software is much more user-friendly.








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Fabrication of Ductwork Using PIR Duct and Pre-Insulated Duct



Ductwork fabrication is a critical aspect of HVAC (Heating, Ventilation, and Air Conditioning) systems, ensuring efficient air distribution and thermal performance. Among the various materials used, PIR (Polyisocyanurate) ducts and pre-insulated ducts have gained popularity due to their excellent insulation properties and ease of installation.

PIR ductwork is made from rigid PIR foam panels, which are known for their high thermal efficiency and fire resistance. These panels are lightweight yet durable, making them ideal for constructing ductwork in commercial and industrial buildings. The fabrication process involves cutting the PIR panels to the required dimensions, shaping them into ducts, and sealing the joints with specialized adhesives or tapes. This ensures airtightness, which is crucial for maintaining energy efficiency and reducing heat loss.

Pre-insulated ducts, on the other hand, come with built-in insulation, eliminating the need for additional insulation layers. These ducts are typically made from materials like aluminum or galvanized steel, with an inner lining of PIR or other insulating materials. The fabrication of pre-insulated ducts involves precision cutting, bending, and assembling of the duct sections, ensuring a seamless fit. The pre-insulated design not only saves time during installation but also enhances the overall thermal performance of the HVAC system.

Both PIR ducts and pre-insulated ducts offer significant advantages, including reduced energy consumption, improved indoor air quality, and compliance with building regulations. Their lightweight nature also simplifies transportation and handling, reducing labor costs. Additionally, the fire-resistant properties of PIR make these ducts a safe choice for modern construction projects.

In conclusion, the fabrication of ductwork using PIR and pre-insulated ducts represents a modern, efficient approach to HVAC system design. These materials provide superior insulation, ease of installation, and long-term durability, making them an excellent choice for energy-efficient and sustainable building solutions.

When it comes to ductwork cutters, safety features are a must. These tools are designed to handle metal sheets, pipes, and other materials, but they can also pose serious risks if not used properly. Whether youre a professional installer or a DIY enthusiast, understanding the importance of safety features can prevent accidents and ensure that your work remains efficient.
One of the most critical safety features in a ductwork cutter is a blade guard. A blade guard is a protective barrier that prevents debris, metal shavings, or other sharp objects from entering the cutting area. This feature is essential because it protects both the user and the cutter from potential injuries. For example, during a recent installation, a worker accidentally knocked the blade guard off and was cut by the exposed blade. Ensuring your cutter has a blade guard can prevent similar accidents.
Another important safety feature is a safety shield. This is a transparent or translucent cover that sits over the cutters blade, reducing the risk of accidental contact. Imagine a situation where a young apprentice was working near the cutter. The safety shield would have protected them from accidentally touching the blade. Safety shields are particularly useful when working in confined spaces or with children present. They provide an extra layer of protection, ensuring that no one gets too close to the sharp blade.
For those who work with more delicate materials, a lockout feature can be a lifesaver. This feature prevents the cutter from starting until the operator has inserted a blank or key into the lock. Without such a feature, a worker could accidentally trigger the cutter and suffer an injury. A lockout feature eliminates that risk, making it an essential safety tool.
Finally, many modern ductwork cutters come equipped with an automatic shut-off mechanism. This feature halts the cutters operation if it detects that the blade has lost contact with the material. While it may not prevent all accidents, it does provide an additional layer of safety by reducing the chance of the cutter continuing to operate after an incident. A case in point is a scenario where a cutters automatic shut-off kicked in after the blade lost contact with the material, preventing further damage and injury.
These safety features are not just nice-to-have options; they are essential for anyone working with ductwork. By prioritizing safety, you can ensure that your work is done efficiently and without risk.

Safety Guidelines for Ductwork CuttersEven the most advanced safety features require proper care and maintenance to function effectively. When it comes to selecting a ductwork cutter, safety guidelines should be followed to ensure that you are using the right tool for the job.
First and foremost, safety training is crucial. Whether youre a professional or a DIY enthusiast, its important to understand how to use a ductwork cutter safely. This includes knowing how to position the cutter, how to hold it, and how to avoid overreach. Regular training can also help you recognize the signs of a malfunctioning cutter, such as a damaged blade or worn-out safety features. A recent incident involving a worker who was cut by a faulty blade guard highlights the importance of regular training.
In addition to training, regular inspections are necessary. Ductwork cutters can accumulate dirt, grease, or other contaminants over time, which can reduce their safety features. Cleaning and lubricating the cutter regularly will keep it in good condition and ensure that it operates safely. You should also check the alignment of the blade and the positioning of any safety guards before each use. A case study involving a cutter whose blade alignment was off led to improper cuts and potential hazards.
Protective equipment is another critical aspect of safety guidelines. Wearing gloves, safety goggles, and a dust mask will protect you from injuries and environmental damage. Safety goggles are especially important when working with flying debris, as they provide a barrier against flying chips and sparks. A recent accident involving a worker who suffered eye injuries due to debris emphasizes the importance of proper protective gear.
Finally, adherence to safety guidelines can save lives. This includes following manufacturer instructions, avoiding overreach, and avoiding risky work practices. If youre unsure about how to use a cutter, its better to err on the side of caution than risk an accident. A case study involving a cutter that was not used correctly led to an injury, underscoring the need for adherence to guidelines.
By following these safety guidelines, you can ensure that your use of a ductwork cutter is both efficient and safe.

Impact of Incorrect Ductwork Cutter SelectionChoosing the wrong ductwork cutter can have serious consequences, both for the user and the environment. In some cases, a poorly selected cutter may not be suitable for the task at hand, leading to inefficient work or even harm to workers. In other cases, the consequences of non-compliance can be more severe, leading to legal or financial penalties.
One of the most obvious impacts of incorrect cutter selection is inefficiency. A cutter that is too small or too large for the material being cut will require frequent adjustments, slowing down the process. Over time, this can lead to increased labor costs and reduced productivity. A case study involving a contractor who used the wrong cutter for a large, HVAC project highlighted the inefficiencies, resulting in delayed completion and increased costs.
The potential for injury is another concern. A cutter that lacks essential safety features, such as a blade guard or lockout feature, can be a liability. Even a minor accident, such as a misfire, can result in injuries that require medical attention. In a recent incident, a worker was seriously injured when a cutter without a lockout feature started unexpectedly. In the worst-case scenario, a poorly selected cutter can cause serious injury or death.
Environmental impact is another factor to consider. Ductwork cutters generate a lot of dust and debris, which can have a negative effect on the surrounding area. Choosing a cutter that is not designed for the job can lead to more dust and a higher risk of contamination. This can be particularly problematic in industries where air quality is a concern, such as construction or manufacturing.
In addition to these practical concerns, incorrect cutter selection can also lead to legal or financial penalties. Many industries have strict regulations regarding the use of equipment, and failing to comply can result in fines or other consequences. In some cases, non-compliance can even lead to criminal charges, particularly if injuries or death are involved.
The impact of incorrect cutter selection is clear. To avoid these consequences, its essential to choose a cutter that is suitable for the task at hand and designed with safety in mind.

Recommendations for Choosing a Safe Ductwork CutterSelecting the right ductwork cutter is a critical step in ensuring safety, efficiency, and productivity. However, there are many factors to consider, and it can be challenging to know which features are most important. Below are some recommendations for choosing a safe and effective ductwork cutter.
First, research the features that are most important to you. Different users have different needs, so its important to consider factors such as blade type, material hardness, and cutting capacity. For example, a cutter designed for thick materials will not be suitable for thin sheet metal, and vice versa. A case study involving a contractor who used a cutter designed for thin materials on a thick HVAC system highlighted the inefficiencies and potential hazards.
Next, prioritize safety features. Blade guards, safety shields, lockout mechanisms, and automatic shut-off devices are all features that should be considered. These features can make a significant difference in terms of safety and longevity. For instance, a cutter with a lockout feature prevented an injury during a recent project.
Material quality is another important factor. Ductwork cutters are made from a variety of materials, including metal, plastic, and composite materials. Each material has its own advantages and disadvantages, so its important to choose a cutter made from high-quality materials that are durable and resistant to wear and tear. A case study involving a cutter made from low-quality materials that malfunctioned during use underscored the importance of material quality.
Additional features, such as a saw blade, cutting depth adjustment, and compatibility with other tools, can also be important depending on your specific needs. However, prioritize safety features first, as they are the most critical.
Finally, read reviews and seek recommendations. Talk to other users or professionals who have used ductwork cutters to get their opinions on whats the best on the market. Reviews can provide valuable insights into the performance and safety of different models. A case study involving a cutter that was highly recommended but had issues in actual use highlighted the importance of careful evaluation.
By following these recommendations, you can choose a ductwork cutter that is not only safe but also efficient and effective for your needs.

Safety Standards and Regulations for Ductwork CuttersDuctwork cutters are regulated products, and their use is governed by safety standards and regulations. These standards are designed to ensure that workers are protected and that equipment is used safely. Compliance with these regulations can help prevent accidents and ensure that workers have a safe working environment.
OSHA (Occupational Safety and Health Administration) standards are a key consideration when selecting a ductwork cutter. OSHA has established guidelines for the safe use of hand-held cutting tools, including cutters. These guidelines emphasize the importance of proper training, regular inspections, and the use of protective equipment. For example, in a recent inspection, a worker was cited for not using a blade guard, highlighting the importance of following OSHA guidelines.
In addition to OSHA standards, industry-specific regulations may also apply. For example, the HVAC (Heating, Ventilation, and Air Conditioning) industry has its own set of safety standards for the use of cutting tools. These standards take into account the specific risks associated with cutting ductwork materials and provide guidance on safe practices.
Safety standards and regulations also emphasize the importance of maintaining and upgrading equipment. Regular maintenance, including lubrication and inspections, is crucial to ensure that a cutter operates safely. Upgrading to newer models with improved safety features is another way to stay compliant with standards. A case study involving a contractor who failed to maintain their old cutter led to a series of incidents, emphasizing the need for regular maintenance.
Compliance with safety standards and regulations is not just a legal requirement; its a way to protect workers. By choosing a cutter that meets these standards, you can ensure that its safe to use and that youre following best practices.
In conclusion, understanding the importance of safety in ductwork cutter selection and adhering to safety standards and regulations can make a significant difference in the safety and efficiency of your work. By prioritizing safety features, following safety guidelines, and avoiding incorrect selections, you can ensure that your work is done responsibly and safely.