Clearing stairwells as an individual is very dangerous and you should avoid stairwells if at all possible. If you must enter a stairwell, the clearing process is actually relatively simple because there is only so much you can do to cover all of the potential exposed angles in a stairwell. As in the hallway, your best option is to use speed to your advantage and get out of the stairwell as quickly as possible. Stairwells are danger areas so move through quickly and find a better fighting position. In commercial or industrial buildings, stairwells typically consist of sturdy metal and concrete construction with steel beams, making them particularly dangerous since bullets are more likely to ricochet off the solid walls.