Energy Efficiency and Noise Reduction with Spiral Ducting in HVAC

What is Spiral Ductwork?

Spiral ductwork, or round ductwork, is a cylindrical form of ducting made by coiling metal strips (typically galvanised steel, aluminium, or stainless steel) into a spiral shape. This ductwork is distinct from the more common rectangular or square duct systems you might have seen. Spiral ducts offer a range of benefits that have made them increasingly popular in various applications, from large-scale industrial installations to trendy modern offices and even residential spaces.

Spiral ducting offers significant advantages in energy efficiency and noise control, addressing critical concerns for HVAC system managers and engineers. This article will delve into how spiral ductwork effectively addresses these issues while providing additional valuable benefits.

Energy Efficiency: Optimising HVAC Performance and Cutting Costs

If you’ve ever had to deal with skyrocketing energy bills, you know how important it is to keep your HVAC system running efficiently. Energy waste in heating and cooling systems is a well-known issue, especially in large commercial buildings, where leaky ducts, inefficient airflow, and equipment can all lead to excessive energy consumption. With energy prices rising and sustainability becoming a priority for many businesses, finding ways to reduce energy waste has never been more urgent.

That’s where spiral ductwork can be a game-changer. Spiral ducts are known for their energy efficiency, which is why more and more facility managers are switching. Let’s explore how this type of ducting can save you energy—and money—in the long run.

1. Minimised Air Leakage

Air leakage is one of the biggest culprits of energy waste in an HVAC system. Studies show that poorly designed or installed HVAC ducting can lose as much as 30% of the air passing through it due to leaks. This is a significant issue in systems with rectangular ductwork, which tend to have more seams and joints where air can escape. More leaks mean your HVAC system has to work harder to maintain temperature levels, leading to increased energy consumption and higher operating costs.

Spiral ductwork, on the other hand, offers a significant advantage in reducing air leakage. The spiral shape means fewer joints and seams than traditional rectangular duct systems. Fewer joints equal fewer opportunities for leaks. Additionally, spiral ducts are often more tightly sealed during installation, and when properly installed, they create a near-airtight system. By minimising air leakage, spiral ductwork ensures that more conditioned air reaches its intended destination—whether cooling down a server room or heating a conference space—without waste.

2. Superior Airflow for Maximum Efficiency

Airflow is another critical factor in determining HVAC energy efficiency. The more smoothly air moves through the ducts, the less strain on your system and the less energy it consumes. With their flat surfaces and sharp corners, rectangular ducts often create turbulence as air passes through. This turbulence can slow the airflow, requiring the system’s fans and blowers to work harder to move the same amount of air. Over time, this extra effort increases wear and tear on the equipment and drives up energy costs.

In contrast, spiral ductwork provides a more streamlined path for air. The smooth, cylindrical design reduces turbulence and friction within the duct system, allowing air to move more freely and efficiently. When air travels more quickly through the ducts, your HVAC system doesn’t have to work as hard to maintain airflow, which can lower energy consumption and prolong the life of your system. Spiral ducts often allow for better airflow even with a smaller diameter than rectangular ducts, meaning they take up less space while delivering the same or even better performance.

3. Space Efficiency and Material Savings

Another often overlooked benefit of spiral ductwork is its ability to handle the same air volume as rectangular ducts using a smaller diameter. Because spiral ducts offer more efficient airflow, you can often install ducts with a smaller cross-sectional area without sacrificing performance. This saves space and reduces the amount of material needed for installation, which can translate to cost savings—both upfront and in the long term.

Spiral ducts can also simplify the installation process by requiring less material and occupying less space. Contractors may spend less time on complex layouts or fittings, which can reduce costs. The smaller ducts also allow for greater flexibility in the design of the HVAC system, as they can be routed more easily through tight spaces.

Noise Reduction: Creating a More Comfortable and Productive Environment

While energy efficiency is a top concern for most facility managers, noise reduction is another pain point that can’t be ignored. HVAC noise can be a significant issue, especially in environments where peace and quiet are crucial—think offices, classrooms, hospitals, or even restaurants. If your HVAC system is too loud, it can negatively impact productivity, concentration, and overall comfort for employees, customers, and visitors. No one wants to work or dine next to a constant hum or a noisy vent.

Spiral ductwork shines here, too. Its design and material properties help create a quieter HVAC system, addressing many common noise issues associated with ductwork.

1. Smooth Airflow Equals Less Noise

One of the main reasons HVAC systems produce noise is turbulence within the ductwork. Air moving through a rectangular duct often hits corners or rough surfaces, creating noise as the airflow becomes more chaotic. This turbulence often leads to the whistling, rattling, or whooshing sounds you may hear in an office or commercial space.

Spiral ducts, with their round shape, significantly reduce this turbulence. The smooth, continuous surface allows air to flow through more naturally, cutting down on the noise caused by sudden changes in direction or velocity. Simply put, less turbulence equals less noise. This smoother airflow helps create a quieter HVAC system, particularly beneficial in noise-sensitive environments like libraries, classrooms, or healthcare facilities.

2. Structural Integrity Reduces Vibration Noise

Another common source of noise in ductwork systems is vibration. Air moving through the ducts can cause the metal to vibrate, producing a low-level hum or rattle. This is especially true with rectangular ducts, which tend to be less rigid and more prone to movement when air is forced through them.

Spiral ducts, however, are naturally more structurally sound due to their cylindrical shape. This built-in rigidity means they’re less likely to vibrate as air moves through, which helps minimise the buzzing or rattling noise that often accompanies other types of ductwork. Additionally, because spiral ducts have fewer joints and seams, there are fewer opportunities for vibration to occur at connection points, further reducing noise levels.

3. Enhanced Soundproofing with Insulation

If noise control is a top priority, spiral ducts also lend themselves well to additional soundproofing measures. These ducts can be easily insulated to provide an extra layer of noise reduction. Insulating ductwork helps dampen the sound of air moving through the system while preventing any noise from escaping through the metal. This is particularly useful in environments like theatres or high-end restaurants, where ambience is critical, and any mechanical noise would be distracting.

The insulation also has the added benefit of increasing energy efficiency. By keeping the conditioned air inside the duct system at the desired temperature, insulation reduces the amount of energy needed to maintain consistent heating or cooling. So not only does the insulation help with noise reduction, but it also helps you save even more on energy costs.

Other Benefits of Spiral Ductwork

In addition to energy efficiency and noise reduction, spiral ductwork offers several other advantages that make it a smart choice for modern HVAC systems. Here are a few more reasons why spiral ducts might be the right fit for your facility:

1. Aesthetic Appeal

One of the reasons spiral ducts have gained popularity in recent years is their aesthetic appeal. In spaces where the ductwork is left exposed—such as in modern office designs, retail spaces, or industrial-style restaurants—spiral ducts offer a sleek, polished look. Their smooth, cylindrical shape can add to the overall design of the space, giving it a clean, contemporary feel.

In contrast, rectangular ducts can look bulky and unfinished when exposed. With spiral ducts, you can achieve a more streamlined look that complements your facility’s architectural style. This is particularly true in open-ceiling designs, where ductwork is part of the overall visual experience.

2. Easier Installation and Maintenance

Another benefit of spiral ductwork is that it’s often easier to install and maintain than its rectangular counterparts. Spiral ducts are typically lighter and more flexible, which can simplify the installation process. Their round shape also makes it easier to fit them into tight spaces or around obstacles, reducing the need for complex fittings or custom fabrication.

Once installed, spiral ducts are generally easier to maintain. Their smooth interior surface makes them less prone to dust and debris buildup, improving air quality and reducing the need for frequent cleaning. Unlike rectangular ducts, which can trap dust in corners and seams, spiral ducts allow for more efficient airflow, preventing particles from settling inside the system.

Additionally, because spiral duct systems have fewer joints and seams, there are fewer opportunities for leaks or cracks to form over time. This means you’ll likely spend less time and money on repairs and maintenance. Should any issues arise, identifying and fixing problems in a spiral duct system is typically more accessible and faster, reducing downtime and disruptions to your facility’s operations.

When Does It Make Sense to Choose Spiral Ducting?

Now that we’ve explored spiral ductwork’s benefits in energy efficiency, noise reduction, aesthetics, and ease of installation and maintenance, you might be wondering whether this option is suitable for your facility. While spiral ducts offer many advantages, it’s essential to consider the specific needs of your building and HVAC system to make the best decision.

Larger Spaces with High Airflow Demands

Spiral ductwork is particularly well-suited for large commercial or industrial spaces where high volumes of air need to be moved efficiently. Manufacturing facilities, warehouses, schools, and office buildings benefit from the improved airflow and energy efficiency spiral ducts provide. These ducts can handle significant air volumes while maintaining smooth, turbulence-free airflow, which is critical in large spaces with varying temperature control requirements.

Facilities Concerned with Noise Reduction

Spiral ductwork is an excellent choice if your facility requires a quieter environment—such as in hospitals, libraries, or offices. The natural noise-reducing properties of spiral ducts and the option to add insulation for extra soundproofing make them ideal for spaces where excessive HVAC noise could be a distraction or a nuisance. Spiral ducts help maintain a more peaceful, productive environment with fewer vibrations and smoother airflow.

Exposed Ductwork in Aesthetic Designs

Spiral ducts offer an aesthetic advantage for spaces where the ductwork will be visible. If your building’s design features exposed ceilings, such as in modern offices, cafes, or retail stores, spiral ducts provide a clean, streamlined look that enhances the overall design. Their cylindrical shape and polished finish make them a functional part of the building’s visual appeal, seamlessly blending form and function.

Facilities Looking to Improve Energy Efficiency

Finally, spiral ducts are a strong choice for facilities aiming to improve energy efficiency and reduce costs. Suppose your building’s HVAC system is responsible for high energy bills, or you’re trying to meet sustainability goals. In that case, the reduced air leakage and superior airflow of spiral ducts can significantly lower your energy consumption. With fewer leaks and less turbulence, your HVAC system can operate more efficiently, using less energy to achieve the same level of performance.

How to Get the Most Out of Your Spiral Duct Installation

If you decide that spiral ductwork is the right choice for your facility, there are a few key factors to remember to ensure you get the most out of your installation. Here’s what to consider during the planning and installation phases:

Choose the Right Duct Material

Spiral ducts are available in several materials, including galvanised steel, aluminium and stainless steel. The best material for your facility will depend on the specific needs of your environment. For instance, stainless steel may be the best option in highly corrosive or high-humidity environments. In contrast, galvanised steel is a durable, cost-effective choice for most standard commercial and industrial applications.

Ensure Proper Sealing and Installation

Even though spiral ducts are designed to minimise air leakage, proper installation, and sealing are still essential. Working with experienced HVAC contractors who understand how to seal and join spiral ducts correctly will help prevent air loss at the joints or connections, maximising the system’s energy efficiency.

Consider Insulation for Added Efficiency and Noise Reduction

If noise reduction is a top priority or your facility operates in extreme temperatures, consider adding insulation to your spiral ductwork. Properly insulated ducts will help reduce noise levels further and improve the system’s energy efficiency by maintaining consistent air temperatures throughout the duct network.

Regular Maintenance for Longevity

While spiral ducts are generally low maintenance, scheduling regular inspections and cleanings is vital to keep your system operating at peak performance. By preventing dust buildup and ensuring there are no air leaks or blockages, you can extend the lifespan of your HVAC system and avoid costly repairs down the road.

Upgrade to Spiral Ductwork with AMS Ducting

By investing in spiral ductwork, you can create a more efficient, comfortable, and cost-effective HVAC system that meets your facility’s needs while minimising operational expenses. Whether managing a busy office building, a quiet library, or a large scale industrial warehouse, spiral ducts can help you achieve your energy efficiency goals and provide a better environment for everyone in your space.

At AMS Ducting, we take pride in providing high-quality spiral ductwork that’s tailored to your facility’s unique needs. Our experienced team is here to help you every step of the way. We understand that choosing the right ducting can be time-consuming, so we’ll take the time to listen to your requirements and guide you to the perfect fit for your HVAC system. With us, you can feel confident that you’re making the best choice for your space.

Contact us today to chat about your project and see how our spiral ductwork can improve your facility’s HVAC system. Whether you have questions, need some advice on the best options for your space, or just want to check out what we offer, our team is here to help.