Computer towers and water heaters would be considered Shred...which is the lowest price usually.
Lest all my towers an heaters do..never had an alum one. lol If I could get an Alum water heater...that would be a nice payout. lol.
My yard doesn't use the term yours does, but we call it shred.
Sirscrapalot - Keeper of the traveling cooler and magic 8 ball master.