I am cabling an old 6 story hotel and intend to use plenum cat 5e to make it fireproof. The customer wants to make the cabling tamper-proof. I am looking for a fire-proof,low-cost alternative to steel conduit. Most raceways are PVC and "fire-retardant". This means they burn at temps above, say 95 degrees, and when they burn they give off toxic gas. So I am thinking this would make my fireproof cable illegal for the firecode. I want to be safe and not have to redo the whole job if inspected. I will have about 10 cables per floor side, requiring 3/4" diameter (I think) feeding to a box that feeds 3 individual rooms. Anyone have any low-cost fireproof suggestions?

I can't find anyone that knows specifically what the fire codes are for telephone cabling or enclosures in the San Francisco area. Does anyone know?