Extra deep U-channel affixed more or less rigidly to the vent and beam, with the dry wall free floating in the channel. Use a forklift to install it, a big fork lift. Don't let a paint-seal form between the drywall and the U-channel or it'll look uglier than whatever, so cut in with at least a coat of primer before you hang.

Extra deep U-channel affixed more or less rigidly to the vent and beam, with the dry wall free floating in the channel. Don't create a paint-seal between the drywall and the U-channel or it'll look uglier than whatever when it shifts over time, so cut in with at least a coat of primer on the dry wall before assembly.

You will likely need a forklift for this project, likely a big fork lift.

Extra deep U-channel affixed to the vent and beam essentially rigidly, letting the dry wall float in the channel. Use a forklift to install it, a big fork lift. Don't let a paint-seal form between the drywall and the u channel or it'll look uglier than whatever, so cut with at least a coat of primer before you hang.

Extra deep U-channel affixed more or less rigidly to the vent and beam, with the dry wall free floating in the channel. Use a forklift to install it, a big fork lift. Don't let a paint-seal form between the drywall and the U-channel or it'll look uglier than whatever, so cut in with at least a coat of primer before you hang.