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The Purification-Type Silent Air Supply FanThe Purification-Type Silent Air Supply Fan is a solution combining ultra-quiet operation with advanced air purification. solution combining ultra-quiet operation with advanced air purification. Features dual-speed motors (below 25 dB), a 3-layer HEPA filter (99% PM2.5 efficiency), and activated carbon odor removal. Ideal for homes, offices, and commercial spaces demanding clean, fresh air without noise disruption.