News- Nantong Henka Environment Solutions Co.,Ltd.

08 Sep

HEPA Filter Micron Size Explained: Why 0.3 Microns Is the Performance Standard

When a specification sheet says "99.97% at 0.3 microns," the natural instinct is to read it as a pore size: a filter media with openings just small enough to stop particles larger than 0.3 microns, l...
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01 Sep

ULPA Air Filter Guide: Efficiency, HEPA vs ULPA Comparison, and Selection Tips

A 0.12-micron particle sits right at the most penetrating particle size for HEPA filter media—the point where HEPA efficiency is lowest. In a semiconductor fab, that one rare particle can ruin an ent...
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25 Aug

What Does a Dirty HEPA Filter Look Like? Visual Signs and When to Replace

The Short Answer: Discoloration, Texture, and Airflow Decide Open the front cover of an air purifier after heavy use and the first clue is visual. The HEPA media that started white or pale beige is n...
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19 Aug

HEPA Filter Rating Chart: Comparing MERV, EN 1822 H13/H14, and Efficiency

Two filter spec sheets sit on the same desk. One is marked "HEPA, 99.97% at 0.3 microns." The other is marked "H13, 99.95% at MPPS." Both vendors describe their products as HEPA filters, yet the numb...
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11 Aug

Mold on Air Filter: What It Means, Why It Grows, and How to Fix It Safely?

You pull the access door off the air handler, slide out the filter, and stop at the sight of dark, velvety patches spreading across the media. The conclusion first: mold on an air filter is a symptom,...
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04 Aug

How Does an Air Purification Box Improve Indoor Air Quality?

An air purification box is a compact, enclosed filtration unit designed to remove airborne contaminants from indoor spaces, ranging from dust and pollen to smoke particles and volatile organic compoun...
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