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Tin tức
Đăng ngày 02/06/2019
To determine the actual amount of decibel deduction applied (when decibels are measured dBA which is the most common), you take the NRR number (in dB), subtract seven, and then divide by two. Given the...
Đăng ngày 02/06/2019
What is difference between NRR and SNR? This is the question most frequently asked when a distributor or end user is looking for technical information on hearing protectors.
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Đăng ngày 26/06/2018
The Pocket Smoke Mask (PSM) filter contains a circulating counter washing layer which is designed for repeated filtering within the effective time span. Toxic particles from the fire have no chance of...
