The Ultimate Guide to Acoustic Ducting

So let’s start with the basics. What exactly is acoustic ducting?

Acoustic ducting is a type of ducting, which can be applied to flexible or rigid ducting, that is designed to reduce noise that travels through ventilation systems. It is commonly used in:

• HVAC systems, it can reduce noise from air conditioners, fans, and the airflow within HVAC systems, thus creating a quieter environment.

• Industrial settings can benefit from acoustic ducting as it can minimise the noise generated by machinery and air handling equipment.

• Settings which require ventilation but as little sound bleed as possible, this can include certain music studios, and other environments in which noise can affect the area.

So now that we have the basics out of the way, how does acoustic ducting work? Generally, acoustic ducting has 3–4 parts that contribute to its noise dampening effects, they are:

• The inner core: This is the standard area affiliated with any piece of ducting, usually made from aluminium or steel, and sometimes plastic.

• Sound insulation: Acoustic ducting features an additional layer of sound absorbing material, this can be made of fibreglass insulation which is wrapped around the outside of the inner core.

• Perforated layer (optional): Some acoustic ducting can feature a perforated inner layer which allows air to pass, but also disrupts sound waves which can contribute to dampening noise.

• Outer jacket: The sound insulation layer is then encased in another layer of aluminium, or other appropriate material, for further protection and durability.

Can ducting insulation be used as acoustic ducting?

Not exactly, if you purchase ducting insulation specifically for sound dampening purposes, you won’t get many results. Although ducting insulation can contribute to a reduction in sound output from a duct, it is not made for that.

Ducting insulation is made specifically to keep the temperature within the duct at a stable and consistent temperature to protect it from instances of condensation. It is not made with the aforementioned layers that acoustic ducting has.

Similarly, acoustic ducting provides a nominal level of thermal insulation, but not to the same standard or consistency as ducting insulation.

Can I use ducting insulation over acoustic ducting?

In theory, yes. If you want the benefits of a reduced sound output from your ducting, in addition to improved insulation, then there is a possibility to use both together. However, this may not be the case in every instance and is subject to the size of the ducting being used.

Why is my ducting still loud?

If you have recently had acoustic ducting professionally installed, and you still find that the sound output hasn’t changed, or has only reduced slightly, consider calling an expert for their diagnosis.

That being said, your main HVAC unit may be the source of the sound. Ensure this is not the case by checking the area where it is housed. If it is the unit itself, it may require maintenance or repair.

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