(i) Only LED-UVC to purify the effectiveness of bacteria in the air<br>(ii) The effectiveness of purifying bacteria in the air only in general filters or HEPA filters<br>(iii) Difference between general filter and HEPA filter to purify bacteria in the air<br>(4) Add a general filter or HEPA filter to enhance the benefits of LED-UVC purification of bacteria in the air<br>(5) Internal wall reflection material to enhance LED-UVC to purify the effectiveness of bacteria in the air and other contents
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