Tyler Wynn
Insulated ducts are used to reduce sound transmission and improve acoustics. HVAC ducts are effective at transporting heated or cooled air, but they also conduct sound throughout a space. To soundproof ducts, one can use acoustic lining, fibreglass insulation, soundproof wraps, or sound-deadening mats. Soundproofing ducts can be a temporary solution for older units until the HVAC system is replaced.
| Characteristics | Values |
|---|---|
| Insulation type | Acoustic |
| Insulation location | Internal |
| Insulation material | Fibreglass, foam, vinyl, wool, rubber |
| Duct type | Rigid |
| Duct shape | Rectangular |
| Additional features | Fire-resistant, smoke-resistant |
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What You'll Learn
Insulating the inside of ducts with acoustic liner
Acoustic duct liners are specifically designed for this purpose and offer superior acoustic and thermal performance. They are made from a variety of materials, including natural fibres, foam, and fibreglass, and can be applied to the interior surfaces of sheet metal ductwork. Some acoustic duct liners are wrapped in a durable, fire-resistant facing, providing additional strength and safety.
When choosing an acoustic duct liner, it is important to consider the sound absorption properties of the material. Open-cell lining materials, such as fibrous insulation or open-cell foam insulation, typically offer the best sound absorption performance. The goal is to absorb as much sound as possible within the duct to prevent it from travelling into other rooms.
In addition to sound absorption, acoustic duct liners also provide thermal insulation. This helps to control heat gain or loss, maintain uniform heating or cooling, and prevent condensation. By improving the thermal performance of your ductwork, you can also lower energy costs by reducing the amount of energy required to heat or cool your space.
To install an acoustic duct liner, it is typically secured to the sheet metal ductwork using mechanical fasteners or welds. It is important to ensure that the product is fire-resistant and safe for use with heating units. By insulating the inside of ducts with acoustic liners, you can effectively reduce noise, improve energy efficiency, and create a more comfortable and peaceful environment.
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Using a flexible insulated duct
Insulated ducts are an effective way to reduce unwanted noise from HVAC systems. They are also used to improve thermal performance by controlling heat gain or loss and maintaining uniform heating or cooling. Duct liners, traditionally made of fibreglass, are installed in rectangular ducts during fabrication on a full coil line, providing both thermal and acoustic insulation.
Flexible ducts, also known as flexible ductwork, are frequently used in HVAC systems due to their ease of installation and flexibility. They can fit into compact or uneven spaces, making them a versatile option for various applications. When installing a flexible duct, it is important to measure the distance between the sites accurately and add a few extra inches to allow for changes and flexibility. The duct should then be cut to the required length using a utility knife, ensuring a straight and clean cut.
To seal and insulate a flexible duct at a collar connection, follow these steps:
- Pull the end of the flex duct over the collar, ensuring the flex duct core extends at least 2 inches past the raised bead.
- Push back the outer liner and insulation.
- Wrap a nylon draw band around the duct, above the raised bead, and secure it with a tensioning tool.
- Thread the draw band through its locking system and tighten it with the tensioning tool.
- Seal the connection with mastic, painting it generously over the draw band and bridging from the inner liner to the collar.
- After securing the inner coil, cover the draw band and seam with more mastic.
- Pull the insulation and outer liner of the flex duct up over the collar, ensuring full contact with the insulation on the trunk line or fitting.
It is important to note that external insulation on ducts is typically used for thermal control, while internal insulation is primarily for acoustic control. Acoustic lining is usually installed on the inside of ductwork to reduce noise. Additionally, larger ducts can help reduce noise by decreasing air velocity.
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Applying sound-absorbing materials externally
Insulating ducts can help with sound control and thermal performance. Typically, duct liners are used to provide thermal and acoustic insulation for HVAC systems. However, duct coverings or duct wraps are also effective alternatives.
When it comes to applying sound-absorbing materials externally, there are a few options to consider. One option is to use duct wraps or coverings. These are installed on-site, reducing concerns about insulation damage during shipping and installation. Duct wraps are susceptible to damage from other trades and take up external duct space, so adequate clearance must be provided. Another option for external sound absorption is to use a heat-resistant soundproofing wrap around the pipes. Additionally, external insulation can be used when dealing with cold air passing through a warm space or vice versa.
In terms of materials, open-cell lining materials such as fibrous insulation or open-cell foam insulation provide the best sound absorption performance. Closed-cell liners can also be effective in certain situations. For example, the SilentFiber Duct Liner is a fiberglass insulation product that is great at absorbing sound and is sold in rolls. It is manufactured from fiberglass wool combined with a high-temperature-resistant resin and is available in one or two-inch thicknesses.
Furthermore, acoustic duct liners can be applied to the interior of sheet metal ductwork for air systems operating within a wide temperature range. These liners help with heat loss or gain and provide excellent acoustical and thermal capabilities. They are secured to the ductwork using mechanical fasteners or appropriate supporting tools.
Overall, while duct liners are typically chosen for acoustic performance, duct wraps and external insulation also play a crucial role in sound absorption and thermal control for duct systems.
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Soundproofing walls and ceilings
Identify the Source of Noise
Before starting the soundproofing process, it's important to identify the source of the noise. For example, if the noise is coming from your HVAC system, ducts, or pipes, you may need to focus on soundproofing those first before moving on to the walls and ceilings.
Use Soundproofing Materials
Specialised soundproofing materials can be used to block, absorb, and reduce unwanted sound transmission. These include:
- Mass-Loaded Vinyl (MLV): This high-density material is effective at blocking and reducing airborne and impact noises in walls, floors, and ceilings. It can be applied to existing surfaces or used as a barrier during construction.
- Acoustic Plasterboard: Adding a layer of acoustic plasterboard to walls and ceilings can help absorb and block sound. Using "Green Glue" or a similar damping compound between layers of drywall or plasterboard can also enhance sound absorption.
- Sound Damping Compound: This compound can be applied between drywall layers to absorb and dissipate vibrations, reducing noise transmission without requiring additional construction.
- Acoustic Caulk: Acoustic caulk or sealant can be used to fill gaps, cracks, and joints in walls, floors, and ceilings, preventing sound leaks and improving overall sound insulation.
- Acoustical Putty Pads: These pads can be used to seal electrical outlets, preventing sound from passing through walls.
- Resilient Channel: This method decouples drywall from the building's structure, minimising sound transfer. It is a cost-effective solution for reducing both airborne and impact noise.
- Wall and Ceiling Hangers: In multi-level buildings, using specialised hangers can isolate sound and reduce vibrations, preventing sound transfer between floors and ceilings.
Increase Mass Between You and the Sound Source
One effective soundproofing technique is to increase the mass between you and the source of the noise. This can be done by using soundproofing insulation within the walls and ceilings. Products like Quiet Batt® Soundproofing Insulation are designed to improve acoustics and reduce sound transfer. Blowing insulation into walls or using dense materials like sand (as seen in professional sound studios) can also help to dampen sound, especially high-frequency noises.
Decouple Surfaces
Decoupling involves separating the inside and outside surfaces to prevent the transmission of vibrations. This can be achieved by offsetting studs so that no stud is connected to both sides, or by using resilient mounts for the inside surface. Decoupling is particularly effective for reducing low-frequency sounds.
Use Sound Absorbing Liners or Wraps
If you're specifically dealing with ducts or pipes, consider using sound-absorbing liners or wraps. Acoustic liners, such as fibrous insulation or open-cell foam insulation, can be installed inside ductwork to reduce noise. Alternatively, duct wraps or blankets can be used to minimise noise from vibrations.
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Using soundproof wraps and blankets
Ducts are often insulated for sound control, but they also serve other purposes, such as thermal performance and controlling heat gain or loss. While lining a duct is typically chosen over wrapping for better acoustic performance, wraps are still an effective alternative for soundproofing. For instance, Quiet Wrap™ Pipe Soundproofing Wrap is a wrap that comprises an industrial-grade barrier/foam composite and a high-density sound barrier membrane. The foam component of the wrap isolates the barrier and dulls vibration sound, which is a large factor in water pipe noise.
Soundproof wraps and blankets are versatile and functional solutions for 'source' noise control. They are commonly used on chillers, refrigeration units, fans/blowers, compressor housings, and hydraulic pumps. These wraps are easy to install and can be used outdoors or in high-heat environments. They are made from composite materials of Teflon-impregnated cloth and loaded vinyl noise barriers. The soundproof wraps are custom-fit to encapsulate noisy equipment and block sound at the source.
Soundproof blankets, also known as acoustic wraps, noise covers, or Velcro-sealed noise blankets, are completely removable and reusable sound barriers. They are made from materials such as Teflon fiberglass cloth, high-density fiberglass mat, and barium sulfate-loaded vinyl. These blankets are designed to fit three-dimensionally around a noise source to help quiet the component creating the obtrusive noise.
Soundproof blankets can also be attached to walls using screw anchors and washers, or other methods such as Velcro, straps, and buckles. They are often used in industrial, commercial, residential, or construction sites for noise control. These blankets are effective in blocking sound through doors and windows, and they can also absorb sound to reduce noise and echo.
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Frequently asked questions
Yes, insulated ducts can dampen sound. Insulation generally improves all duct sounds.
There are several ways to insulate ducts, including using fibreglass insulation, acoustic foam, soundproofing wraps, and sound-absorbing liners.
Some products that can be used for duct insulation and sound dampening include Quiet Wrap™ Pipe Soundproofing Wrap, Quiet Barrier® Specialty Composite, Dynamat, Roxul, and JM Linacoustic.
Yes, alternatives to duct insulation include using sound attenuation devices, duct silencers or mufflers, and soundproof blankets.
When choosing a method or product for duct sound dampening, it is important to consider the type of noise you want to reduce, the shape and material of the ducts, and any safety considerations such as fire resistance.
