The Importance of Air Exchange in Buildings: Why Are Fans Essential?

In today's world, where we are increasingly focusing on energy efficiency and insulation of buildings, it is also necessary to pay attention to the quality of air exchange. Due to the insulation and sealing of modern buildings, natural ventilation is reduced, leading to increased concentrations of carbon dioxide (CO2) and humidity in the interior. Therefore, it is crucial to implement forced ventilation systems that ensure efficient air extraction from indoor spaces, contributing to a healthier and more comfortable environment for all residents.

Balanced Ventilation System: How Does It Work?
One of the most common systems, primarily used in residential and public buildings, is a combination of forced exhaust with natural air intake, such as through windows or doors. This balanced system means that the amount of air extracted by the fan must be evenly replaced with fresh air coming from outside. If air intake into the room is not provided, for example, through ventilation grilles in doors, the exhaust air cannot be removed.

Another, and much more efficient, option is the use of a heat recovery unit, which not only ensures balanced ventilation but also transfers heat from the expelled, exhaled air to the incoming fresh air via a recovery exchanger. The ideal solution is our local heat recovery unit SRJ 3W, which is also suitable for renovations.

A person exhales approximately 20,000 liters of air daily and sweats 2–5 liters of water. This process leads to an increase in humidity and CO2 concentrations indoors, which can negatively affect the health and comfort of residents. Experts recommend that 0.1 to 0.3 times the volume of the room should be extracted per hour to ensure sufficient ventilation.

How to Choose the Right Fan?

The selection of a fan depends on several factors, including the length of the air duct and the required airflow.

Axial Fans for Short Ducts, Diagonal Fans for Longer Ducts
Axial fans are suitable for short ducts up to 3 meters with low pressure loss or for direct exhaust through the wall. This type of fan is commonly used in residential construction, such as in bathrooms, kitchens, or toilets. However, if the duct exceeds 3 meters in length, it is recommended to use radial or diagonal fans, which have higher pressure efficiency, although they are slightly more expensive.

Installation Guidelines for Fans

Proper installation of the fan is key to its long lifespan and quiet operation. It is recommended to install fans either horizontally or vertically with the motor axis in a horizontal position. Fans should not be installed on drywall constructions as this could cause unwanted resonance. Instead, it is recommended to securely mount them to the building structure, such as to a wall.

Noise and Performance of Fans

Fans can generate noise due to aerodynamic noise from the passing air and vibrations. Our fans are designed to minimize noise and ensure a comfortable environment. The sound pressure level is measured 1.5 meters from the fan on the intake side and reaches approximately 40 dB(A). When measured at 2 meters, the noise level drops to about 33 dB(A).

Sliding or Ball Bearings?

Sliding bearings have a lifespan of up to 24,000 hours. For comparison: if the fan is used 20 times a day for 30 minutes (i.e., 10 hours daily), it will reach a lifespan of approximately 4,000 hours annually, which means at least 5 years of reliable operation, but usually lasts up to 10 years.
Ball bearings have a longer lifespan of up to 30,000 hours, but they tend to be slightly noisier.

Why Choose Our Fans?

Our fans are highly efficient and offer several advantages over competitors, such as:

Patented Backdraft Damper: Our AV PRO fans feature a patented backdraft damper with minimal resistance, ensuring efficient airflow and preventing the backflow of cold air.
Fan Design: The fan's impeller at the outlet directs turbulent airflow, increasing fan efficiency and reducing losses.
Durable Housing and Impeller: The fan housing is made of impact-resistant white plastic and is designed for wall mounting. The impeller is also made of impact-resistant plastic, ensuring long lifespan and durability.
Design: The AV DRIM fans are designed with an elegant, unobtrusive look, ensuring effective ventilation for bathrooms and toilets without disrupting the interior.
Performance: Our DVP HIDE diagonal fans are known for their high performance, which allows them to exhaust air over longer distances and effectively ventilate larger spaces.

Conclusion

Investing in a quality fan is an investment in the health and comfort of all residents. Our fans offer effective and quiet solutions for indoor ventilation, whether for homes, offices, or other spaces. Visit our online shop at shop.haco.cz and choose from our wide selection of fans that meet your requirements.

For more information, don't hesitate to contact us. We are here to help you select the ideal fan for your needs.