This can be translated as “the sky closed” or "the doors in the sky closed." It is figurative language that means that the rain stopped coming down. See how you translated "the windows of heaven opened" in [Genesis 7:11](../07/11.md).
This can be translated either as "The fountains … and the windows ... closed up" or "Yahweh closed the fountains … and the windows …" (See: [[rc://en/ta/man/translate/figs-activepassive]])