For extra protection at the bottom of the door or for additional sealing, a sweep or door bottom can be added. Typically interior applications do not use an ADA sill unless the door falls between a climate and non-climate controlled area. Note: A maximum clearance of up to 3/4 inch from the bottom of the door to the finished floor is permitted for labeled openings
779S Door Bottom

The door bottom wraps the entire bottom of the door and provides a seal against water and air. A door bottom is recommended for higher traffic commercial openings.
Drawing
801S Door Sweep

The sweep is attached to the face of the door and seals against air. The sweep is recommended for the interior applications.
Drawing
200NA Door Sweep

The sweep is attached to the face of the door and seals against air. The sweep is recommended for the interior applications.