1.It is recommended to replace a filter in 10-25 days. When used in bad weather or as a virus protection, the filter element needs to be replaced faster.

2.The difference between BP100 and BP100A: mainly because the size of the host filter is different, BP100: 12 * 50 * 76mm, BP100A: 18 * 55 * 82mm, the air volume of BP100A is 20% larger than BP100.

3.The mask part supports water washing and can be recycled.

When you have a large order demand, please contact us, I will give you the best price.