Min. Font Size & Type for "Out-Of-Service" Sign?

I need to label some deflagration vents as "out-of-service" since they are not being maintained properly and are currently not needed from a code standpoint (as the use of the room has changed). We do not want to remove them as the room may be changed back one day depending on research needs.

Does anyone know if there is a code reference that points to the size of the letters or font type for an out-of-service-tag?

In this case a tag is not practical since it needs to go on a flat panel. I know there are such requirements for exit and "no exit" signs, but I'm not aware of any code guidance for out-of-service signs. Thanks in advance for any feedback.

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