**Application of Air Filters in Production Plants**
Air quality requirements vary significantly across different factories. Facilities equipped with fume hoods and pollution control systems often need to replenish large volumes of air. If the ambient air is contaminated, it must be filtered before being distributed to the workplace. In industries like semiconductor manufacturing and pharmaceuticals, air cleanliness is critical. A typical work environment may have 500,000 particles per cubic foot, while the latest standards for semiconductor production require only one particle per cubic foot. To maintain this level of cleanliness, clean air must be continuously circulated through HEPA filters. To extend the life of these filters, pre-filters with lower efficiency are typically used in combination. Industrial cleanrooms demand the removal of very small particles, and while HEPA filters were once the most efficient, newer ULPA filters now offer higher performance. Future developments will likely bring even more advanced filtration technologies. Microglass fiber media remains a primary choice, but membranes and electrostatically enhanced materials are also gaining traction in certain applications.
For factory exhaust gases, the most stringent requirement is toxicity. Heavy metals such as mercury, arsenic, chromium, and antimony are highly toxic, and their emission limits are extremely strict. In the U.S. and Germany, new regulations have reduced the permissible air toxicity limit from 20 mg/m³ to 0.1 mg/m³. To meet these standards, advanced filters capable of capturing submicron particles are essential. Some German companies use traditional folded microglass HEPA filters combined with pulsed air cleaning systems to increase filter density. Meanwhile, a U.S. company has developed a tubular microfiber HEPA filter design.
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**Application of Air Filters in Hospitals**
The healthcare industry demands high levels of air cleanliness. Typically, hospital air is filtered using a combination of a 30% efficiency prefilter and a 90% efficiency final filter. While HEPA filters are not always required, they are essential in special areas such as isolation rooms, testing zones, and critical care units. Many hospital HVAC systems use 100% outdoor air to reduce the risk of airborne infections, which is effective in preventing contamination. However, this approach does not eliminate microbial growth on filter media, so advanced HVAC systems are still necessary.
Cleanrooms in hospitals were first introduced in operating rooms, especially for orthopedic surgeries that last longer and carry a higher infection risk. The ideal air cleanliness level near the operating table is 100, achieved by using top HEPA filtration systems covering at least a 3m x 3m area. Other cleanroom applications include birthing rooms, neonatal units, burn centers, and cardiac care units. Recently, cleanrooms have also been adopted for dental procedures to reduce infection risks during long operations.
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**Application of Air Filters in Office Buildings**
Improving indoor air quality in office buildings is driven by the widespread use of modern office equipment. Devices like computer terminals, inkjet printers, photocopiers, fax machines, and laser printers emit ozone, volatile organic compounds (VOCs), hydrocarbons, and particulates, which can harm both people and equipment. It's estimated that 30% of U.S. office and public buildings face indoor air quality issues, with airports and train stations being particularly challenging due to high traffic and air volume.
For example, O’Hare Airport in Chicago has an air flow of about 51.66 million cubic meters per minute. To ensure clean air, the facility uses 1,100 pre-filters, 1,100 final filters, and 2,200 carbon filters—each needing monthly replacement. The global market for air filters in offices, commercial, and public buildings was expected to reach $500 million by 2000.
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**Mobile Clean Sampling Vehicles**
A mobile clean sampling vehicle is a portable device designed to provide a controlled, purified environment for raw material sampling. It is widely used in GMP-certified facilities due to its cost-effectiveness, ease of use, and mobility.
**Working Principle**
The vehicle uses a centrifugal fan system to draw in air through medium-efficiency and high-efficiency filters. Clean air is then evenly distributed via a laminar flow hood, ensuring a consistent and purified working environment for sampling. This system provides uninterrupted power and maintains the required air quality for accurate results.
**Structural Features**
The frame is constructed from dust-proof, high-precision plate material, while the working area is made of stainless steel veneer. This design ensures good sealing, durability, and an attractive appearance.
**Technical Parameters**
| Model | JC-900 | JC-1200 |
|-------|--------|---------|
| Cleanliness Level | Class 100 @ ≥0.5μm (US Federal 209E) | Class 100 @ ≥0.5μm (US Federal 209E) |
| Colony Count | <0.5 pcs/dish (90mm culture plate) | <0.5 pcs/dish (90mm culture plate) |
| Noise | ≤62dB(A) | ≤62dB(A) |
| Average Wind Speed | 0.25–0.6m/s | 0.25–0.6m/s |
| Vibration Half-Peak | ≤0.5μm (X·Y·Z) | ≤0.5μm (X·Y·Z) |
| Illuminance | ≥300LX | ≥300LX |
| Power Supply | AC, single phase 220V/50HZ | AC, single phase 220V/50HZ |
| Max Power Consumption | 400W | 800W |
| Weight | 160kg | 300kg |
| Working Size | 730×650×950mm | 1030×650×950mm |
| Dimensions | 900×730×1950mm | 1200×730×1950mm |
This mobile unit is ideal for maintaining clean environments in various industrial and laboratory settings.
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