Saddle Thresholds are designed as part of a total opening system to seal the bottom of your door, creating a more finished look for commercial applications. Saddle thresholds for commercial doors span the width of the door jamb and are mounted to the finished floor. They are installed underneath the door on the finished floor when the door is in a closed position. Saddle thresholds help prevent airflow beneath a door which can save energy costs. Thresholds retard sound transmission between two spaces. In the event of a fire, a threshold can help stop the transfer of smoke through the gaps under the door.