Why Use Metal Ducting?

Why Use Metal Ducting?

Metal ducting is a crucial element to facilitate ventilation, but why does it need to be used? Why can’t plastic ducting be used? Does metal have special properties?

In this blog, we will answer the question ‘Why use metal ducting?’ Whilst providing information that can help you when it comes to ducting and all things HVAC related.

To prevent mould, fresh air should constantly be introduced into your dwelling daily, as it helps to regulate temperature and reduce condensation. Introducing fresh air can be as simple as having a ventilation routine, or installing extractors or PIV systems. Almost all of this is facilitated by ducting.

I-Sells is here to provide the answers you need whilst also supplying you with all the information you need to combat mould and have a well-ventilated home.

What is the point of ducting?

Ducting is the key component of ventilation. Without it, you would have no control over any air that is being extracted or released. Ducting essentially acts as a path for the ventilated air to travel through.

Ducting can come in many sizes, from larger circumferences to smaller, and can be made from metals or plastic components. There are options to purchase rigid ducting, which is not manoeuvrable, and flexible ducting, which can be manipulated to fit in many kinds of spaces.

Is it better to have rigid or flexible ducting?

This depends entirely on the space you choose to install it. Flexible ducting is the better option for tighter spaces, however, it is more prone to breakage, and a reduced airflow if you bend it incorrectly.

Rigid ducting is set and can’t be altered in shape, meaning the airflow will be consistent. Because it is rigid, it is generally strong too, meaning breakage is less likely. Rigid ducting suffers from not being manoeuvrable. Although this can easily be rectified if there is enough planning before installation.

Both options are equally viable, and both would benefit significantly from having insulation applied to them, insulation helps to keep the temperature regulated in the ducting. Additionally, it also provides an extra layer of durability, although it isn’t significantly durable. It can be applied and secured simply with ducting tape.

Is ducting the same as pipes?

This is an understandable question as they both can pretty much look the same, and do the same thing. However, the key difference with the two is what they carry. Pipes generally carry fluids through them, whereas ducting will carry air or other gasses.

There may be exceptions to this rule, but in most domestic settings, this is the norm.

Why use metal ducting?

Why use metal ducting?

It can be confusing when looking at plastic and metal ducting, and trying to figure out why you would need one more than the other. But the answer is relatively straightforward.

Metal ducting is mainly used for vented systems that are subject to a larger and more frequent amount of heat. In home environments, this can be seen with cooker hoods. Beyond that, they would likely be used in industrial environments, or large scale systems in public buildings.

Additionally, some metal ducting is ideal for environments that have hazardous compounds (such as in industrial environments). In these instances, stainless steel ducting is the preferred choice in environments where corrosion is possible.

The benefits of metal ducting are as follows:

  • It can be used in rooms that have appliances that emit a lot of heat
  • High-quality galvanised aluminium ensures long-lasting function
  • Ideal for industrial environments
  • Can be insulated.

Can I buy metal ducting?

Yes! Alongside being a provider of mould solutions such as extractor fans and PIV systems, I-Sells also provide ducting for those looking to buy and install their ducting themselves.

We provide round ductwork fittings and accessories in a large range of diameters to suit all purposes, including HVAC systems and extractor fans. Our metal ductwork is manufactured from high-quality galvanised Aluminium. 

Are metal ducts better than plastic?

In certain situations, metal ducting can be better than plastic, simply because some metal ducting has the capacity to be more resilient in certain environments. Although metal ducting is a necessity in some areas, it is not in others.

Plastic ducting is generally cheaper, and applicable in many set-ups.

When should I replace metal ducting?

Where can I buy metal ducting?

Before any replacement of metal ducting or HVAC systems, we strongly recommend having an expert check before you make any changes. That being said, here are some clear signs that your metal ducting has to be changed.

  • Significant rust on the ductwork
  • A reduced input/output (this can indicate a large amount of dust inside the ducting)
  • Broken areas that allow air to escape, whether this is on the ducting pipe or the connecting joints
  • Condensation on the ductwork
  • If the ducting hasn’t been checked or worked on in years
  • Mould in areas neighbouring the ducting (could be an indication of mould being within the ductwork.)

How does ducting get mould?

Unfortunately, mould can form in ducting, over time this can cause serious repercussions to your health and the overall health and performance of the ventilation system that the ducting is facilitating.

Essentially, mould forms in ducting due to condensation that can occur through breakage in the ducting, poor maintenance, and faults that cause humidity to form within the ducting.

Mainly, the likelihood of metal ductwork growing mould is very low. However, this can happen if certain circumstances are met. A clean, sealed duct will present an environment where mould can’t grow, this changes with the introduction of dust & humidity.

Can I prevent damage in my ducts?

Yes, it is entirely possible to prevent damage to your ducting, which can ensure it will last longer. Here are the most simple steps you can take…

  • Cover the ducting with ducting insulation.
  • Regularly check for any holes in the ducting
  • Ensure any connections between the ducting are completely secure.
  • Ensure that your ventilation system/ ducting is checked by a HVAC expert.
  • Be vigilant by making sure the ducting is not near any leaks or water, or that no leaks have appeared near, next to, or in/on the ducting.

Can I still use metal ducting if it is rusted?

We would not recommend using ducting that has rusted, especially if the rusting is advanced. Rusting results in the rusted object flaking away, eventually, if left untreated or not replaced, this rusting can affect the structural integrity, as well as the general strength of the duct.

In some circumstances, items can be restored from rust damage, whilst an area of ducting that has rust damage should either be replaced entirely, or have the affected area removed and replaced.

Is there an alternative to ducting?

As yet, there is no alternative to ducting that can provide the same level of efficiency without the use of the ducts themselves. Alternative conduits have not been found. Although there may be other materials that can influence the effectiveness of a ducting system, they have not been distributed on a mainstream basis.

Purchase metal ducting today

Purchase metal ducting today

We at I-Sells endeavour to ensure our customers have all the information they need before investing in our mould solutions. Be sure to visit our blog page to learn about the vast array of factors and issues surrounding ventilation, mould, condensation, and much more.

We hope to have answered the question “Why use metal ducting?’’

We understand you may have more questions, do not hesitate to contact us for more information about whatever you require our help with. If you’d like to email us, click here. For other contact options, see below:

Call us on 020 8463 9696

Visit us at our showroom:


Monday – Friday: 8:00 am to 5:30 pm

Saturday: 9:00 am to 12:00 pm

Sunday: Closed

15 St John’s Parade

Sidcup, Kent

DA14 6ES

United Kingdom

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