The Down To Open 4252 sign will show people that they will need to push a handle down in order for the door to open. The handle on this sign specifically sticks out to the right.
This sign may be essential to provide people with very clear instructions on how to vacate a building if there is ever an emergency. If people are panicking, they may not realise how to open the door.
Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.