This is a residential setting ie a private house. There is no plenum. It is a sheet rock ceiling that will be insulated. This was by order of an electrical inspector from the New York Board of Fire Underwriters. The inspectors here apparently go along with whatever municipality or utility has juristiction.
Air tite recessed cans are nothing new they are available from most can manufacturers, they are however more expensive than ic and non-ic cans and are usually special order.
I am going to challenge the inspector to see why he is demanding this requirement. I am using ul listed ic rated cans and unless he is going to pull some kind of energy code on me they should suffice.
