People used to use flexible plastic "duct" for dryers - the stuff
with the wire coil in it. I've seen it wherer basically only the coil
was left intact - with the plastic melted right out. That crap hasn't
been legal for likely 30 years or more (if it ever was)

Isn't PVC wire hosing still used for portable air conditioner exhaust?
https://amzn.to/3bIAw2U (hose with wire reinforcement)

Portable AC exhaust isn't hot.

Obviously. But my question was referring to the material the hose is
made of, to help determine whether such hose material is still being
legally sold.