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The first filter is usually an outer nylon mesh which catches pet hair and large particles of dust. This filter should be cleaned on a regular basis using a handheld vacuum cleaner if possible. The second level of defence is a carbon filter which usually consists of thousands of tiny black beads contained in a collection of separate honeycomb-shaped pods. This filter keeps the air smelling fresh and will need replacing after several months. The final and most important filter is the HEPA (High-Efficiency Particulate absorbing Filter). This filter is made from a specialised plastic or fibreglass. The HEPA is the last line of defence – it’s the one that deals with the smallest particulates – and this filter will also need to be changed after about six months use. Most decent models will also tell you when to change the filter.

United kingdomHigh efficiency particulateParticulate matterAir quality indexPurifier coolDyson linkParticular matterVolatile organic compoundBasic breatherModified granular carbonஒன்றுபட்டது கிஂக்டம்உயர் செயல்திறன் துகள்துகள் விஷயம்அேக தரம் குறியீட்டுடைசன் இணைப்புகுறிப்பாக விஷயம்