3m filters for face masks a1 a2 abek1 p2 p3 3m 6051 this 3m8482 gas amp combination filter a1 can be used on all 6000 7000 and 7500 series half masks and full face masks lightweight with low breathing resistance the filter remains well balanced when fitted to a mask providing excellent field of vision as a result of the unique trapezoidal shape 3m 6051 gas amp combination filter a1 4 pairs