Iso-Mix 100 mm In Line Acoustic Low Noise Silent Mixed Flow Extractor Fan 4"

The Blauberg ISO-RB Ultra-Silent Ventilation Centrifugal Inline Fan is one of the quietest inline fans available, with noise levels as low as 34 dB(A) at 3 meters.

It's designed for minimal noise disruption while providing efficient ventilation.

To minimise noise when installing an inline fan, start by choosing a quiet fan with a low decibel rating and consider one with a variable speed controller to reduce noise at lower speeds.

Use rubber mounts or suspension systems to isolate the fan from the structure, preventing vibration-related noise. Installing the fan in a remote location, such as an attic or basement, and using longer duct runs can also help keep noise away from living areas.

Next, use acoustic or insulated ducting to dampen the sound of air moving through the ducts. Properly sized ducting reduces air resistance and noise, and adding an in-line silencer or muffler can further reduce sound.

Sealing all duct connections with quality tape or clamps prevents air leaks that could create additional noise.

Finally, after installation, test the fan at different speeds, and listen for any noise. If necessary, adjust the speed or reposition the fan to reduce noise further.

Checking for and eliminating any remaining vibrations by adding isolation materials ensures that the fan operates quietly and efficiently.

Yes, you can make an existing inline fan quieter by following several strategies. Here's how:

1. Check and Adjust Mounting

Vibration Isolation: Ensure the fan is properly mounted with vibration dampeners, such as rubber mounts or pads. This reduces the noise caused by vibrations transmitting through the structure.
Flexible Ducts: Use a short run of flexible ducting at the outlet and inlet vents to reduce vibration transmission. Rigid ducts can transmit noise more easily.

2. Use a Fan Speed Controller

Lower Fan Speed: If your fan supports variable speed, reducing the fan speed slightly can significantly reduce noise without a major impact on performance.

3. Insulating the Ducts

Acoustic Ducting: Replace standard ducts with acoustic or insulated ducting that absorbs sound. This helps reduce noise traveling through the ducts.
Duct Silencers: Install a duct silencer or muffler. These devices are specifically designed to reduce the noise from the airflow and the fan itself.

4. Enclose the Fan

Soundproof Enclosure: Build or buy a soundproof box or enclosure around the fan. Ensure it has proper ventilation to avoid overheating the fan.
Add Soundproofing Materials: Line the enclosure with sound-absorbing materials like acoustic foam or mass-loaded vinyl.

5. Regular Maintenance

Clean the Fan: Dust and debris can accumulate on the fan blades and motor, causing imbalance and additional noise. Regular cleaning helps maintain efficiency and reduce noise.

6. Consider Fan Replacement

Quieter Fan Models: If the current fan is excessively noisy, you might consider replacing it with a newer, quieter model. Look for fans that are specifically designed for low-noise operation.

Implementing one or more of these strategies should help reduce the noise from your inline fan, making your environment quieter and more comfortable.

The Blauberg ISO-RB Centrifugal Inline Box Fan is powerful and quiet, delivering airflow rates up to 7000 m³/hour (1945 l/s) with noise levels as low as 34 dB(A).

This fan is ideal for applications demanding high ventilation capacity while maintaining quiet operation​.

• Low noise levels (dB ratings).
• Variable speed control.
• High-efficiency motors (EC motors).
• Sound-insulating casing.
• Flexible installation options.
• High airflow rates with low noise output.

Reducing the noise from an inline fan can significantly enhance the quietness of environments where silence is important.

Here are some effective ways to minimise the noise:

Using a fan speed controller can make a big difference. By slightly lowering the fan speed, you can reduce noise without sacrificing much performance. Just ensure the controller is compatible with your specific fan.

Installing a duct silencer is another great option. These attachments can be added to your duct system to absorb and reduce noise, especially when placed near the fan or at the ends of the duct.

Switching to acoustic ducting can also help. Replacing standard ducting with insulated or acoustic versions can reduce noise transmission thanks to their sound-dampening materials.

Properly mounting the fan is crucial. Using anti-vibration mounts or padded brackets can minimise noise caused by vibrations. It's best to avoid mounting the fan directly to rigid surfaces.

Adding soundproofing material around the fan can further reduce noise. Enclosing the fan in a box lined with soundproofing foam or mass-loaded vinyl is effective, and wrapping soundproofing blankets around the fan or ductwork can also help.

It's important to check for any obstructions or damage. Make sure the fan blades are clean, undamaged, and well-balanced, as misaligned or damaged blades can cause noise. Also, ensure there are no blockages in the airflow within the ducts, as these can contribute to noise.

Positioning the fan further away from noise-sensitive areas can make a difference. Extending the length of the ducting between the fan and the outlet will decrease the noise heard at the outlet.

If noise is still an issue, consider upgrading to a quieter inline fan model. Some fans are specifically designed for low-noise operation.

Regular maintenance is key to keeping your fan running quietly. Cleaning the fan regularly to remove dust and debris will ensure it operates more smoothly and quietly.

By applying these strategies, you can effectively reduce the noise produced by an inline fan and create a more peaceful environment.

Noise levels measured at a distance of 3 meters (about 10 feet) provide a practical indication of how loud a fan will be in a typical room setting.

This distance is commonly used because it simulates the proximity of a person to the fan in a real-world environment. For example, the ISO-MIX-100 fan has a noise level of 29 dB at 3 meters, which is very quiet. To put this into perspective, 29 dB is roughly equivalent to a whisper or the ambient sounds in a library.

Such a low noise level makes the ISO-MIX-100 fan suitable for noise-sensitive environments like bedrooms, offices, or studios where maintaining a quiet atmosphere is important.

Acoustic Inline Fans

An 'acoustic' inline fan is designed specifically to minimise noise during operation. These fans typically feature sound-insulating materials, such as dense rock wool, around the fan casing and ducts to absorb noise. This construction helps to significantly reduce the sound levels produced by the fan, ensuring a quieter operation. For example, the ISO-MIX-100 utilises a 50mm layer of sound-dampening mineral rock wool to achieve this noise reduction. This makes it an excellent choice for environments where maintaining a low noise level is crucial, such as in residential areas, offices, or studios where peace and quiet are highly valued.

Sound Levels in Decibels (dB)

Noise levels measured at a distance of 3 meters (about 10 feet) provide a practical indication of how loud a fan will be in a typical room setting. This distance is commonly used because it simulates the proximity of a person to the fan in a real-world environment.

For example, the ISO-MIX-100 fan has a noise level of 29 dB at 3 meters, which is very quiet. To put this into perspective, 29 dB is roughly equivalent to a whisper or the ambient sounds in a library.

Such a low noise level makes the ISO-MIX-100 fan suitable for noise-sensitive environments like bedrooms, offices, or studios where maintaining a quiet atmosphere is important.

Noise levels measured at a distance of 3 meters (about 10 feet) provide a practical indication of how loud a fan will be in a typical room setting. This distance is commonly used because it simulates the proximity of a person to the fan in a real-world environment.

For example, the ISO-MIX-100 fan has a noise level of 29 dB at 3 meters, which is very quiet. To put this into perspective, 29 dB is roughly equivalent to a whisper or the ambient sounds in a library.

Such a low noise level makes the ISO-MIX-100 fan suitable for noise-sensitive environments like bedrooms, offices, or studios where maintaining a quiet atmosphere is important.

An 'acoustic' inline fan is designed specifically to minimise noise during operation. These fans typically feature sound-insulating materials, such as dense rock wool, around the fan casing and ducts to absorb noise.

This construction helps to significantly reduce the sound levels produced by the fan, ensuring a quieter operation. For example, the ISO-MIX-100 utilises a 50mm layer of sound-dampening mineral rock wool to achieve this noise reduction.

This makes it an excellent choice for environments where maintaining a low noise level is crucial, such as in residential areas, offices, or studios where peace and quiet are highly valued.