How is a user seal check performed?
A user seal check should be performed by the wearer prior to entering a contaminated area. For disposable respirators, the subject cups both hands over the front of the respirator and then inhales sharply. A negative pressure should be felt inside the respirator. If any leakage is detected at respirator edges, straps should be adjusted by pulling them back along the sides and/or repositioning the respirator. For a reusable elastomeric facepiece, the cartridges are covered by the hands and the subject gently inhales and holds his breath. The facepiece should slightly collapse. If air leakage is detected, readjustment of the mask and/or straps is required. The user seal check should be repeated until the respirator seals to the face. If the proper fit cannot be obtained, the wearer should not enter the contaminated area and should contact their supervisor.
