Height Requirement on Fire Extinguisher/Alarm Signs

I am in California and I have not had much luck on here or online to get a solid answer on the heigh requirements for Fire Extinguishers and Alarm Signs. Does anyone here know or know somewhere where I can get this information. I have already tried calling the fire chief, just have not been able to get a hold of him. Thanks.

 

Well not exactly what I was looking for, i know about emergency exit signs. I was asking about placement of fire extinguisher signs and fire alarm signs. Completely different. But I did get a hold of my fire inspector, seems its round 5 feet to the top of the sign, depending on visability for extinguisher signs, as for alarm signs, use your best judgement.