Optimal Size for Versatility and Convenience: Our pre-filter measures 36.5 x 17.5 cm (14.4 x 6.9 inches) with a thickness of 8 mm, making it compatible with most soldering fume extractors available today. These dimensions provide ample surface area to capture heavy smoke and dust, enhancing filtration efficiency and promoting a cleaner work environment.Effortless Installation for Optimal Functionality: The installation process is simple and tool-free. Just attach the cotton pre-filter over the HEPA and activated carbon filters of your fume extractor and secure the unit back in place. No cutting or measuring required, enabling quick and hassle-free setup.Designed to Extend Filter Lifespan and Efficiency: These cotton pre-filters act as the first stage in your fume extraction system. They effectively capture larger airborne particles such as sawdust, hair, iron filings, paper debris, and PM50 smoke, helping to protect the main filters and extend their service life.Wide Application Scope: These pre-filter replacements are suitable not only for soldering fume extraction but also for use in dust removal, laser smoke filtration, DTF printing, beauty salons, printing operations, and welding applications. They help maintain a clean, safe workspace and support improved indoor air quality.Ample Supply for Continual Use: Each order includes 10 pre-filter replacement pads. This generous quantity ensures consistent performance and provides a long-lasting supply for ongoing use.Color: White Material: Polyester fiber Package Contents: 10 x Pre-Filter Pads Note: Light reflection and differences in display screens may cause slight variations in color representation. Measurement tolerance is +/- 1-3 cm.