/ Product catalogue / Domestic ventilation / Residential axial fans / Quiet fans: a brief guide to the product range
It is no secret that for a long time, noise level was not considered a key characteristic when choosing a domestic fan. Performance has always been a priority, as it is what ensures that the main function — removing stale air from the room — is fulfilled. Customers were more willing to pay for high performance than for other characteristics, such as energy efficiency or quiet operation, which became secondary when choosing a fan.
However, today the situation has changed somewhat: domestic fans have long been a source of noise pollution in the home, just like range hoods, refrigerators, and washing machines. However, today the situation has changed somewhat: domestic fans have long been a source of noise pollution in the home, just like range hoods, refrigerators, and washing machines. In small rooms, especially bathrooms, where there are many hard and smooth surfaces (ceramic tiles, plumbing fixtures, mirrors), sound waves are hardly absorbed. As a result, the sound is reflected repeatedly, creating an echo, and even a regular fan with an average noise of 38 dBA seems louder. Users quickly tire of such an annoying background noise and often just stop turning on the ventilation, which leads to excess moisture and mold.
This is one of the reasons why the modern approach to designing domestic ventilation has changed dramatically. Previously, the main goal was to provide rooms with fresh air, whereas today this is not enough and user comfort must also be taken into account. However, comfort is not an abstract concept. In the context of domestic ventilation equipment, it has very specific technical criteria.
In this case, comfort means a set of technical specifications and features that affect how convenient it is to use the equipment on a daily basis. This refers to the extent of automated control, flexibility of settings, and noise level. These factors shape the user's practical experience as well as their perception of the ventilation system as comfortable.
When it comes to noise, we should specify how we measure it. As mentioned at the beginning, most standard domestic fans installed in homes today have an average noise level of around 38 dBA. For a closed room, this is a significant burden on hearing. If such a device operates continuously, it causes so-called noise pollution, which a person may not notice consciously, but the nervous system reacts sharply to it.
Achieving quiet operation of a domestic fan is a complex task that requires many factors to be taken into account: everything from the design and motor to the installation and layout of the ductwork. In this section, we will review the key steps and technical solutions that help ensure optimal noise levels in any living space.
The first and key factor determining the noise level is the right choice of fan model itself. No installation or add-on solutions can compensate for a structurally noisy model. In recent years, the residential ventilation market has changed significantly. Noise reduction is no longer a secondary factor and has become a separate area of development. Manufacturers have revised their approach to design: they have optimized the shape of the impeller, adjusted the speed modes, and improved the motors. These changes have resulted in the emergence of special quiet series, which are designed from scratch to minimize noise while maintaining the required performance.
Even if fans have the same connection diameter and performance, this does not necessarily mean they will operate equally quietly. In practice, the difference between models can reach 5–10 dBA, and sometimes even higher. On the surface, this difference seems insignificant, but in real operating conditions, it results in two different noise levels—from almost imperceptible operation to noticeable background humming.The difference in decibels becomes noticeable in bathrooms and apartments with thin walls or at night. When the overall noise level in a room is low, people become much more sensitive to noise.
To better understand how different noise levels of domestic fans are perceived, it is helpful to compare them with familiar household sounds. Below is an approximate perception scale for Vents models.
| Category | Noise level [dB(A)] | Perception | Comparable to |
| Super quiet | 21–25 | Extremely quiet. | The rustling of leaves or a very quiet room at night. |
| Extra quiet | 26–28 | Very quiet. The sound of airflow is soft and diffuse. | Background noise in an apartment with high-quality soundproof windows. |
| Quiet | 29–34 | A quiet sound that is perceived as a barely audible hum. | Whispering at a distance of 1 m or the ticking of a wall clock. |
| Standard | 35–40 | Moderate but quite acceptable background noise. | A quiet library or the noise of a modern refrigerator compressor. |
The size of the fan and its performance directly affect the noise level. Choosing an overly powerful device for a room can cause additional noise pollution for the user without providing any extra benefits. On the contrary, a fan that meets actual needs works efficiently and quietly.
The key point is the right size. For standard fans with an airflow of about 90 m³/h, the optimal connecting diameter is 100 mm. It is not worth reducing the diameter below the recommended value, as the fan will have to operate more intensively, which increases noise and reduces the service life of the bearings. Thus, the balance between performance and size is key to the quiet and efficient operation of a ventilation system. By selecting a fan based on the size and needs of the room, you minimize unwanted noise and ensure long-term operation.
All the necessary guidelines and rules for calculating airflow are available in detail in the article “Determining the required airflow for rooms. Design recommendations.” This article will help you choose the right fan performance and size for your room "Calculation of the required air exchange. Ventilation design recommendations." This article will help you choose the right fan performance and size for your room.
One of the key factors affecting fan noise is its motor. Inexpensive models with roller bearings often have a shorter service life and can produce extra noise over time. Therefore, when choosing a domestic fan, consider the type of motor and its design technology. There are two types of motors that dominate the domestic fan market:
Another key aspect that impacts noise level is the number of fan speeds available. Modern residential fans can have one, two, or several speeds, allowing you to flexibly adjust airflow to meet the actual needs of the room. For everyday ventilation of a bathroom or toilet, lower speeds are usually sufficient to ensure fresh air with minimal noise. High speeds are only used when intensive removal of excess moisture, vapors, or unwanted odors is required.
In modern homes and ventilation systems, continuous ventilation mode is becoming increasingly popular, where the fan runs continuously at minimum speed. This trend is driven by the dense, airtight insulation of modern buildings: continuous operation helps maintain normal humidity and air quality, reducing the risk of condensation, mold, and stale air getting trapped, which is especially important in bathrooms and kitchens.
The minimum speed provides quiet and continuous ventilation, and the higher speed (boost) is only activated when needed — for example, after showering or when strong odors appear to quickly remove excess moisture. This mode combines comfort, silence and efficiency, mitigates the acoustic load on the user and extends the service life of the fan.
The optimal choice of operating mode allows you to combine comfort and efficiency: the fan runs quietly when it is important and powerfully when operating conditions demand it. This approach reduces the acoustic load on the user and prolongs the device's service life, as the motor does not run at maximum speed all the time.
Modern domestic fans can be programmed to operate on a schedule, ensuring effective ventilation while minimizing the running time when the device is not needed. This feature helps users maintain a comfortable indoor climate without wasting electricity and reduces noise pollution.
There are different ways to implement scheduling. The simplest option is a timer delayed on/off, which can be paired with humidity, motion, or light sensors so that the fan only runs when it is really necessary. More advanced systems offer controlled, automatic periodic ventilation, removing the need to manually turn on the device when people are in the room.
| T Timer — standard adjustable switch-off delay timer with a response time of 2 to 30 minutes. |
| T1 On/Off timer — provides a switch on/off delay for a set period of time. |
| T2 On/Off timer — operates based on when the room is in use. |
| H Humidity sensor — the humidity sensor autonomously selects the optimal humidity level for the room the fan is installed in. The fan's operating logic is determined based on statistical analysis of the humidity level in the room. |
| R Motion sensor — it is triggered when motion is detected within its range. |
Even the quietest fan can generate unwanted noise if the air duct is designed or installed improperly. The fan is the source of the sound, and the air duct can either reduce or amplify it. In some cases, the duct effectively acts as a resonator.
Most residential ventilation systems use rigid plastic (PVC) air ducts. Their main advantage is a perfectly smooth inner surface. Unlike flexible corrugated ductwork, which creates constant resistance, rigid plastic provides stable air flow and less turbulence. What is a turbulent zone? It is an area in the air duct where the air moves irregularly and chaotically, forming vortexes. However, even in rigid systems, turbulent zones can form, creating extra whistling and hissing, which is often perceived as a “hum in the shaft.”
Mechanical vibrations are another factor that can significantly affect the noise of a domestic fan. As the impeller rotates, small vibrations occur, which can transmit to the wall, ceiling, or air duct and be amplified by the building's structures.
Such noise usually appears as a hum or rattle and is especially noticeable if the fan is installed on lightweight structures — for example, drywall or plastic panels, which can act as resonators.
The most common causes of vibration are loose installation of the fan, tilted casing when installed, clogged or imbalanced impeller, and uneven wall surfaces. Even a small amount of play when fastening can lead to vibrations being transmitted to the building structure and additional noise.
Choosing a domestic fan requires a professional approach, given the complexity of technical specifications and associated legal restrictions. Many countries have strict building codes and electrical safety standards that prohibit end users from installing electrical appliances themselves. The installation and connection must be performed exclusively by an authorized, certified specialist.
Such an expert helps to determine the required fan performance, taking into account the area of the room, its purpose, and intensity of use, and also evaluates the optimal standard size, operating modes, and speed control of the fan model. Inadequately selected or installed equipment may be overloaded, generate excessive noise, or fail to provide sufficient air circulation, whereas a professional assessment allows for the optimal balance of performance, energy efficiency, and comfort.
Besides technical correctness, proper installation is a must for keeping the manufacturer's warranty valid and meeting property insurance requirements. A certified specialist guarantees that the selected model complies with the safety and energy efficiency standards in force in a particular region. This ensures stable operation of the ventilation system throughout its service life and eliminates legal risks for the property owner.
Furthermore, an expert is well versed in the range of ventilation equipment and the features of different models and manufacturers, enabling them to select a solution that best suits the operating conditions and ensures reliable and quiet operation of the ventilation system.
VENTS offers a wide range of quiet domestic fans for bathrooms, showers, toilets, and kitchens. Depending on the series, the noise level can start at 21 dBA, and some series, such as Vents Arc, have a special mode where the noise level drops to just 9 dBA—almost at the threshold of human hearing.
However, quiet operation does not limit the equipment’s functionality. The VENTS range includes smart models with various modes designed to maintain optimal comfort, design solutions for modern interiors, as well as classic energy-efficient and powerful fans designed to meet the diverse needs of consumers.
