

I’m using a bunch of IKEA Billy bookshelves to turn a room into a library. Unfortunately, there’s two return air ducts behind a couple of the bookshelves (see image). I will probably have the door open to the library most of the time, but I suspect I still need to provide some sort of air flow to the area behind the shelves.
What I’ve done so far is drill through the holes in the front all the way up and down the sides but since those holes are tiny, I’m not sure it’s enough. I was also trying to find a very small grille (I think the smallest I saw was about 4 inches x 4 inches) and I could maybe cut a small hole on the back and put one or two of those up.
What kind of advice do you have for me?