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The ceiling is directly sealed on the top, and the curtain is directly on the top. Make the hole big enough to the beam.
As far as you are concerned, the ceiling treatment is a relatively unsuccessful practice!
If you have a door beam, you can smash it! As long as there is no wall on the upper floor, it will not have much impact if you remove a small part of the suspended beam. If the beam is built with a wall! Don't mess around.
You can do modeling, it's best to find a designer to see, use the beam to make a modeling, it's not expensive.
Look at the height of the beam, if it is high, it can be sealed directly, if it is low, you can make a few false beams.
You've got a little bit of a low house, so you break it from the lowest girder, and you can shape it, and you can put the gicbule in one high and one low.