Why Do Some Filters Have Strips Across the Media?

If you’ve ever taken a close look at a air, cabin, fuel or hydraulic filter, you may have noticed thin strips - made of silicone or acrylic - running across the media. These don't need to be removed, they're playing a crucial role in ensuring the filter performs at its best.

1. Maintaining Structural Integrity

Over time, airflow or fluid pressure can cause the filter media to shift or collapse, reducing efficiency. Strips help reinforce the media, keeping it in place and ensuring even distribution of particles for maximum filtration.

2. Optimising Airflow & Performance

Uneven pleats or folds in a filter can create areas of higher resistance, reducing overall effectiveness. Strips help maintain uniform spacing, allowing air or liquid to flow smoothly while maximising the available surface area for filtration.

3. Preventing Bypass & Leaks

Filters are designed to trap contaminants, but without proper support, small gaps or deformations can form, allowing unfiltered air or fluid to pass through. Strips act as a secondary seal, reducing the risk of bypass and improving overall filtration efficiency.

4. Enhancing Durability

Whether exposed to high temperatures, vibration, or prolonged use, filters need to withstand demanding conditions. Silicone or acrylic strips add flexibility and resilience, helping the filter maintain its shape and function over time.

The Bottom Line

Filters with structural support strips are designed for long-term performance, offering better durability, efficiency, and reliability. Whether in air, fuel, hydraulic, oil, or water filtration, these strips are a sign of thoughtful engineering and quality manufacturing.

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