metal heat duct blocking J-box location, how to proceed???
In order to center the ceiling fixture, I need to put in a box just where a circular aluminum duct runs. Even moving the fixture 4" to get it next to the duct will be noticeable. Is it code to attach a metal box right to the duct with screws (I would have to bang in the duct a little to make it fit into the ceiling). Or perhaps to cut out the profile of the box and place part of it in the duct? Is heating of the box an issue? Can I insulate it somehow?
My last resort is to bang up enough of the duct to attach it to the adjoining joists via a chandelier hanger junction box. This location is near the end of the longest duct run of the house and won't impact air flow that much.