stovepipe

stove +‎ pipe

stovepipe (plural stovepipes)

1. Sheet-metal tubing used as a chimney for a stove or furnace.
2. A channel for information which is compartmentalized in such a manner that some parties who might be interested in its use or be able to utilize it are restricted from accessing it.

• stovepipe hat

stovepipe (third-person singular simple present stovepipes, present participle stovepiping, simple past and past participle stovepiped)

1. To collect or store (information) in a compartmentalized manner, so that some parties who might be interested in its use or be able to utilize it are restricted from accessing it.