Most respirators will often come with instructions on how to wear them, depending on their design. However, all follow the same general procedure. You need to wash your hands first and inspect the respirator for any flaws. If it appears damp or damaged, do not wear it. Cup the respirator in your hands with straps hanging below your hand and a nosepiece at your fingertips. Cover your nose and mouth with the respirator ensuring there are no gaps. Secure the straps at the back of your head and below your ears without crisscrossing them. Perform a seal check by placing your hand over the exhalation valve and breath out. Your mask should bulge slightly without air leaking. If you feel any leakage, readjust, and test again. If you cannot achieve a proper seal, try a different mask, and don't expose yourself to fumes.