In the design of underground garage ventilation systems, two common approaches are natural ventilation and mechanical ventilation. Although natural ventilation is often the most cost-effective method, it greatly impacts the overall building layout and outdoor landscaping. For instance, if a residential complex with a basement area of about 40,000 square meters adopts natural smoke exhaust and natural air supply, the total opening area on the top slab could reach 1,200 square meters. Such large openings not only damage the visual aesthetics of the community but also interfere with fire lanes and building foundations. As a result, natural ventilation is rarely used in practice, and it is mainly suitable for single-level basements rather than multi-level garages.

Mechanical ventilation, on the other hand, is more practical. Commonly, centrifugal or mixed-flow ventilation fans are selected for garage use. Considering the operational characteristics of residential garages in China, fans are rarely used except during specific conditions such as the rainy season in southern regions.

 Therefore, the demand for high-efficiency, energy-saving models is not significant, and there is no need for variable-frequency fans or dual-unit systems, which would increase cost and occupy additional space. Instead, dual-speed exhaust fans are typically recommended due to two main advantages:

Lower cost and reduced space requirements: Fewer fans are needed, which saves investment and decreases the size of fan rooms.

Meeting both ventilation and smoke exhaust needs: During daily operation, airflow speed is usually kept under 10 m/s. However, during fire emergencies, the airflow speed can be increased up to 20 m/s since noise is less of a concern. Dual-speed fans allow flexible adjustment for both conditions without oversizing ducts, thus avoiding waste of materials and simplifying installation.

In addition, current standards require garage ventilation systems to link with fire protection systems and be controlled by CO detectors during daily operation. However, given the low daily usage of underground garages and the growing popularity of electric vehicles (which emit no CO), the need for extensive CO monitoring and high-frequency air changes is expected to decrease in the future.

Therefore, underground garage ventilation systems in residential areas are generally simple, focusing on functionality and cost-effectiveness rather than complexity. As places where people spend only a short time, garages should prioritize fire safety ventilation while providing adequate daily air circulation. In this context, high-airflow air blowers and dual-speed exhaust fans represent the most balanced choice, ensuring both safety and efficiency.

Our company specializes in the R&D and production of air blowers, ventilation fans, and exhaust fans. With reliable performance and efficient airflow, our solutions are widely applied in underground garages, industrial facilities, and household appliances. We are committed to delivering products that meet building safety standards while offering cost efficiency and long-term reliability. If you are looking for a trusted partner in garage ventilation and smoke exhaust solutions, we are ready to support your needs.