In addition to formaldehyde? Industrial grade? Net red? These empty net pass rates are actually 0
In the past two years, annual sales of air purifiers have hovered around 6 million units. Among these, a product known as FFU (Fan Filter Unit) has gained significant popularity on e-commerce platforms. Recently, the Shanghai Quality Supervision Bureau commissioned the Shanghai Environmental Protection Industry Association to conduct an investigation into the quality and safety of this product. The findings revealed high risk levels, raising concerns among consumers.
Beyond formaldehyde—online sales of industrial-grade purifiers should be avoided!
FFUs, short for Fan Filter Units, are typically used in industrial settings like cleanrooms and production lines. However, they are now being marketed online with labels such as "industrial grade," despite not being designed for home use. A quick search for "FFU" on e-commerce sites reveals nearly 1,000 products, priced mainly between 1,500 and 2,500 yuan. Many of these products highlight their advanced purification capabilities, claiming to outperform standard household air purifiers.
The reporter noticed that while there are various models available, they all share similar designs—metal casings and cabinet-style structures. Most claim superior performance in removing particulate matter, such as PM2.5, and even formaldehyde. One particular model boasted a CADR (Clean Air Delivery Rate) of over 1,000 m³/h, with monthly sales exceeding 1,100 units and over 3,000 reviews with a 97% positive rating.
Wang Kang, secretary of the Air Clean Industry Committee at the Shanghai Environmental Protection Industry Association, noted that top-selling FFU products were sampled for testing. The tests focused on electrical safety, particle removal efficiency, and formaldehyde purification capability.
A total of 13 batches of FFU products were tested. Only four met national standards, while the remaining nine failed to comply with any relevant regulations. The results showed that 11 of the products had actual PM2.5 purification capacity less than 60% of the claimed value. For example, one product advertised a PM2.5 purification rate of 1,200 m³/h but was measured at only 600 m³/h—less than half the stated value.
Shen Hao, a senior engineer at the Shanghai Metrology Institute, confirmed that the formaldehyde purification capacity of all 13 tested FFU models was significantly lower than advertised. The highest measured value was just 30% of the claimed level, and nine models had values below the detection limit. Experts concluded that these devices offer almost no formaldehyde removal capability.
**13 Industrial-Grade Purifiers Have Zero Pass Rate**
Air purification ability is a key performance metric for air purifiers, but safety is the most fundamental requirement for household appliances. From 2014 to 2016, the Shanghai Municipal Bureau of Quality Supervision conducted three consecutive inspections of household air purifiers, all of which passed with a 100% safety rate. However, this time, the FFU purifiers tested during the risk assessment showed a 0% pass rate for safety standards.
The risk investigation followed mandatory national standards, testing three critical areas: protection against touching parts, stability, and mechanical hazards. According to the standards, moving parts in electrical equipment must be adequately protected to prevent injury.
During the test, a qualified household air purifier was compared. Its internal motor fan was fully enclosed, preventing direct access to dangerous components. In contrast, all 13 FFU models failed the mechanical hazard test, with 100% of them exposing live parts and wiring. This poses serious risks of electric shock or physical harm to users.
Experts warn that selling industrial-grade devices intended for commercial use in residential settings is highly problematic. The Shanghai Environmental Protection Industry Association has reported the findings to the Shanghai Quality Supervision Bureau, and the results will be made public.
Zhu Weidong, president of the Shanghai Environmental Protection Industry Association, emphasized the need to enforce strict standards for household air purifiers and ensure that products unsuitable for home use are not sold to consumers.
Are you using one of these FFU purifiers at home? It might be time to reconsider.
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