Air filter Q&A

Nonwoven fabric refers to a sheet-like material that is not woven, as the name suggests. It is a type of material that combines concepts from paper and felt with advanced technologies in organic and polymer chemistry. Depending on the application, various synthetic fibers and other materials can be combined to freely design physical and chemical properties. Japan Vilene’s air filters are made from nonwoven fabric.

Nonwoven filters have a porous structure. By combining fibers and adhesives, the pore size can be controlled and selected according to the application. They feature an optimal “density gradient” structure for air filtration, where the density increases from the air inlet side to the outlet side. This allows for low pressure loss, high filtration efficiency, and large dust-holding capacity. (Note: Some product types may not have a density gradient.)

Japan Vilene’s air filters are specifically designed for air filtration. Please do not use them for other purposes.

Filter selection should consider the air conditioning system, operating conditions, and relevant regulations. Key factors include:

1. Purpose of air purification
2. Intake air volume and dust concentration
3. Circulated air volume and dust concentration
4. Room usage
5. Fan capacity
6. Filter performance
7. Maintenance costs

Important performance indicators include pressure loss, efficiency, and service life. Evaluating these factors will help you select the optimal air filter.

When air passes through a filter, the filter creates resistance, resulting in a pressure difference between the inlet and outlet. This difference is measured using a manometer (e.g., U-tube or inclined manometer). The pressure loss is the difference between the upstream static pressure (inlet) and downstream static pressure (outlet) at a given airflow rate, expressed in pascals (Pa).
Conversion: 1 mmH₂O = 9.8 Pa

Pressure loss is calculated using the following formula:

Pressure Loss = Upstream Static Pressure (pressure at the filter inlet) − Downstream Static Pressure (pressure at the filter outlet)

Yes, some filters can be regenerated by washing with water or using spray cleaning. (Note: Not all product types are washable. Please refer to the pages of Viledon air filter for details.)

For long-term use in high-temperature environments such as dryers or baking ovens, please use heat-resistant filters. Depending on the duration of use, we offer:

• AE-100 for 120–180°C
• AI-100W for 180–240°C
• PI-100W for up to 300°C

They are generally durable for standard HVAC applications. However, in certain environments, strong acids, strong alkalis, or highly aggressive solvents may degrade the fibers or adhesives used in the filters.

Yes, we offer filters with antibacterial and antifungal properties.

If the filter gets slightly wet, it will return to its original state once dried, and no issues should arise. However, if a large amount of water (e.g., rainwater) forms a water film on the filter surface, the pressure loss may temporarily increase. Please ensure the filter is not directly exposed to water droplets.

Each filter type has a specified final pressure loss value. As long as usage stays within this range, pressure resistance is not an issue. Exceeding the final pressure loss may affect performance.

Deodorizing filters contain adsorbents such as activated carbon embedded within the filter layers. They are effective in removing odors from kitchens, sludge, and exhaust gases. We also offer filters that handle vaporized acids, alkalis, and solvents. Please contact us for more information.

Yes, we offer air filters for car air conditioning systems that clean the air entering the vehicle interior. These include dust filters that remove pollen and deodorizing filters that eliminate exhaust odors. They help maintain a comfortable cabin environment even when using outside air.