These lightweight, half face respirators feature a detachable neck strap that allows the facepiece to drop down to the investigator’s chest. These low maintenance respirators can be disassembled, cleaned, and reused many times. No parts to replace except filters or cartridges. The 3M 6800 Medium respirator fits 80% of the population, and most individuals that fit the large respirator, can also fit this respirator. The dimensions of this mask from top to bottom are 7.5 inches with an opening of 5-1/2 inches. From side to side, the width of the opening is roughly 5.5 inches, with the opening being about 4-1/4 inches.