3M3200 dust masks. 3200 dust masks (top dust equipment) Model: 3200 3700 cotton filter masks main seat 3701 cotton filters (1) Uses: Can be used for mining, foundry, metal smelting, and other operations generated sanding dust protection! Installation instructions: 3200 3700 cotton filter masks and the socket at each docking a small arrow, when installed, the alignment of these two arrows, press firmly with the palm of your hand, I heard a click sound that is installed! In order to ensure that their adhesion, the installation will be a bit tight, if you need dispensers installed, please explain in advance! A condensate Optional: 1, and asked what this dust masks dust can reach the standard A: This is a 3M3200 masks dust masks with 3700 filter cotton seat body composition requires adding 3M3701 cotton filter before use; filtering criteria for filtering 0.075 micron filtration rate of 90%; 2, whether cotton filters can be cleaned using A: cotton filters are not cleaned. 3,1 piece cotton filter can be used how long Answer: Use a cotton filter is generally a week or so, the specific time depends on the frequency of the dust size with the use of respiratory resistance in the sense of using filtered or contaminated should be replaced immediately quilts ;