The Door Unlocked In Working Hours 5137 Sign will communicate this rule effectively to people and make sure the rule is obeyed. The sign states To Be Kept Unlocked During Working Hours in white whiting on a circular blue background.
Without using this sign, you will not be able to guarantee that the rule will be respected. As the sign is AAA photoluminescent, it will glow in the dark if there is a lack of lighting.
Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.