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PrintablesBenHark
Quick and Easy coronavirus face mask Respirator
Key points 1 Uses household tissues as the filter. 2 Large filter area. This reduces the flow rate per area and allows more layers (12 – 16) to be used, thus increasing filtration efficiency. 3 Comfortable because the only thing against…
- Pobrania
- 298
- Polubienia
- 9
- Ocena
- 4