This replacement fan blade fits the Dry Air Force 9 air mover.
To remove unscrew four center bolts and gently pull the center hub evenly straight out. If it does not easily pull off DO NOT hit the shaft. Next to the center of the hub where the shaft comes out there's an empty screw hole. Using one of the four center bolts tighten that into the empty screw hole and it will push the blade off the shaft. Once off, remove the bolt and replace.