Review on 🎭 Advanced Activated Meltblown Non Woven Respirator with Replaceable Filters by Jeb Moorehead

These PM2.5 filters are virtually airtight. I tried pushing air through the filter but the resistance was extremely high (similar to pushing air through a layer of jeans). In other words, when this filter is in the mask, the air entering and exiting will most likely take the path of least resistance, passing through the mask area without blocking the filter and/or gaps around the mask, reducing efficiency significantly reduced. masks.