What makes this mask so unique is that it features active circulation. That is to say, it features an electronic fan that assists in circulating the air in the mask. To put it more concisely, this is a mask with a fan on it.
What makes this mask so unique is that it features active circulation. That is to say, it features an electronic fan that assists in circulating the air in the mask. To put it more concisely, this is a mask with a fan on it.