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Handing is how a door opens. Generally, you want a door to open toward a wall if one is nearby and away from the traffic flow. Imagine yourself standing in front of the door, outside the room or building. If the door swings in and opens to the left, it’s a left hand swing. If the door swings out, it is a left hand reverse. If you’re standing in front of the door and it swings to the right, it’s a right hand swing. If the door swings out and opens to the right, it’s a reverse right hand swing.