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In wall conduit code ?

In wall conduit code ?

In wall conduit code ?

Hope this where I should ask this. We are cabling(voice and data)a small building and need to run 4" conduits between floors within the outside walls. They do not want cores in the floors.
2-questions. Does code allow 4" plastic pipe to be ran within walls (actulally we want to use the lighter 4" drainpipe in 10'legnths)?
Next, the drywall in this building runs up to the cielings on the outside walls which leads me to think they are fire rated. Can I cut out, say 2x2 sections of the drywall to access the conduits and run the cabling through then, fire stop around the conduits leaving them accessable for cabling in the future?
Thank you for any information.

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