While you may want to have consistently clean indoor air, a noisy air purifier can be frustrating. With Alen air purifiers, you can have clean indoor air without disruptive noise. Our air purifiers combine powerful air cleaning with whisper-quiet operation. Wohoo! The Alen BreatheSmart 75i, for instance, operates at high speed at only 51 decibels, about the same as a refrigerator. This decibel level is much quieter than other similar air cleaning performances. It's an easy choice when seeking tranquility and clean air in your living spaces. Ready to dive into the details?
How Many Decibels is a Quiet Air Purifier?
Let’s start with the basics—how do you measure noise? Decibels (dB) measure the intensity of sound, with each 10 dB increase representing a tenfold increase in noise level. For air purifiers, noise output typically ranges between 20 to 70 dB. Let’s put these numbers in perspective—a whisper is about 15 dB, a refrigerator operates around 40 dB, normal conversation is approximately 60 dB, and a vacuum cleaner can reach 85 dB. Alen air purifiers operate quietly with a range of 23 dB to 51 dB for most of our models. Quieter than sleeping with a fan to moderate rainfall, Alen air purifiers’ noise levels ensure a soothing environment. With Alen, you can have clean air without the disruption. In other words, you can have your cake and eat it too!
The Best Quiet Air Purifiers for Your Home
Air Purifier Model | CADR | Low Speed (dB) | High Speed (dB) | Coverage Area (Sq ft/hour) |
| Alen BreatheSmart 75i v2 | 375 | 25 dB | 51 dB | Up to 2,800 sq ft |
| Alen BreatheSmart 45i | 245 | 23 dB | 49 dB | Up to 1,600 sq ft |
| Alen BreatheSmart 35i | 190 | 29 dB | 42 dB | Up to 1,000 sq ft |
When selecting an air purifier, you’ll want to consider its noise level. A quiet air purifier is essential for maintaining your ideal home environment—whether you work from home or need a quiet space to sleep. Just how quiet are Alen air purifiers? This chart compares the low and high-speed noise levels of the BreatheSmart 75i, 45i, and 35i. As the chart shows, Alen’s BreatheSmart 75i has air purification coverage of up to 2,800 sq. ft. and operates exceptionally quiet at only 51 dB at high speed—a powerful combination. Alen air purifiers are whisper-quiet when compared with other similar brands, which operate at 52 - 70 dB at high speeds.Ready for more info? Read on for a fuller description of these Alen models.
1. Alen BreatheSmart 75i
The Alen BreatheSmart 75i is one of the quietest large-room air purifiers. Operating at just 25 dB on its lowest setting to only 51 dB on turbo mode—comparable to a refrigerator humming—the 75i is ideal for bedrooms, offices, and living spaces where you want to maintain low noise levels. This model also emits pink noise that can help you sleep better than white noise. The 75i’s quiet performance is complemented by its powerful air purification capabilities for spaces up to 2,800 sq. ft., HEPA filtration, smart sensor technology, and ENERGY STAR certification to ensure efficient performance and tranquil air all day, every day.
2. Alen BreatheSmart 45i
The Alen BreatheSmart 45i offers a whisper-quiet purification experience, operating at just 23 dB at low speed—quieter than rustling leaves—making it one of the quietest air purifiers available. It remains unobtrusive on its high setting at 49 dB, conducive to undisturbed sleep and focus-friendly operation. Designed for rooms up to 1,600 sq. ft., the 45i uses H13 HEPA filters, smart air quality sensors, and Auto Mode for hands-free operation. All these features plus its ENERGY STAR certification make it a smart and efficient choice for quiet, effective air purification.
3. Alen BreatheSmart 35i
The Alen BreatheSmart 35i delivers exceptional quietness, running as low as 29 dB to just 42 dB on its highest setting. Whether for a bedroom, nursery, or workspace where noise levels matter, this compact yet powerful purifier covers up to 1,000 sq. ft. It features an H13 HEPA filter, smart sensors, and Auto Light Mode. The 35i is also ENERGY STAR certified.
What else is great? You can monitor and manage your Alen air purifiers from the Alen app.
What Makes Alen Air Purifiers So Silent?
Alen designs air purifiers for quiet performance, ensuring effective air purification without disrupting your environment. What’s the secret? Our air purifiers operate quietly through several innovative technologies:
- WhisperMax Technology: Uses aerodynamically optimized fan and air chamber designs to minimize noise while maintaining high airflow efficiency.
- Advanced HEPA Filtration: High-efficiency particulate air filters capture airborne particles with minimal resistance—reducing the need for high-speed fans and lowering noise levels.
- Smart Sensor Technology: Monitors air quality in real time and adjusts the fan speed accordingly, ensuring the purifier operates at the lowest necessary setting to maintain quietness.
- Precision-Tuned Motors: High-quality motors engineered for smooth and quiet operation, reducing mechanical noise and enhancing overall performance.
Alen is constantly innovating. These cutting-edge technologies enable Alen to design some of the quietest air purifiers on the market. Rest assured, our air purifiers easily integrate in your bedrooms, offices, and other spaces—just as you’d want them to.
Breathe Cleaner, Quieter Air with Alen
Alen air purifiers stand out as the best choice for those seeking whisper quiet, highly effective air purification. With quiet operation, they blend seamlessly into your home while delivering powerful filtration that captures 99.9% of airborne particles (0.1 micron and larger). Designed for optimal sleep quality, Alen purifiers feature advanced technology to promote restful nights. Their smart sensors, customizable filters, and energy-efficient design make them a top-tier investment for clean, quiet air.
Experience the difference of silent, effective air purification. Find your perfect Alen home air purifier today.
Quiet Air Purifiers Frequently Asked Questions
Creating a peaceful environment with your air purifiers should be a top priority. Below are answers to common questions about maintaining quiet operation:
1. How do I reduce the noise in my air purifier?
Check for debris inside the unit as dust buildup or small objects can cause unusual sounds. Also, position the purifier in a well-ventilated space, away from walls or furniture, to prevent airflow obstruction and minimize noise. Alen units can be quieter than others with similar flow due to factors such as larger HEPA filters, scientifically designed fan chambers, and more free flowing intakes and exit vents.
2. What is the ideal noise level for an air purifier?
The ideal noise level for an air purifier depends on its location and personal preference. For bedrooms or quiet spaces, models operating between 20 to 40 decibels (dB) are preferable. In more active areas, slightly higher noise levels may be more acceptable. You can determine how to balance noise levels with purification performance to ensure comfort and indoor air quality.
3. Will I be able to sleep with an air purifier running?
Yes, many modern air purifiers are designed for quiet operation, making them suitable for use during sleep. It’s a matter of preference as to what people prefer for sleep. Some want near silence, so speed 1 is better for them. The “noise” for Alen units is pleasing, so if some low, deep fan noise is conducive to sleep for you, you’ll be able to sleep even when the units are on a higher fan speed than 1.
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