Bathroom door vent

I created this out of necessity, my door was a specific size, and I needed a vent so the fan in the bathroom could suck in outside air.I also added flaps inside so no air can get out. They are not perfectly airtight, but they don’t need to be, it’s just to prevent having an open hole in the door.I hope it's useful for someone, just as it is for me! 😊