On: Ask HN: Any LAN alternatives other than PowerLine ...

[ip26]

One clever hack you can use in some homes is to run cat5 in your HVAC ducts.

Even if you can’t direct-connect to the router, perhaps you can move the router a few rooms closer.

[teeray → ip26]

That is probably not up to code

[1letterunixname → teeray]

You clearly haven't run premise wiring commercially or residentially.

I would use non-halogen plenum, cat8, shielded cable. Stranded for bare connectors or solid core for 110 punchdown on a wall plate + J box.

[doctorpangloss → teeray]

There is plenum safe Ethernet cable.