This is the largest nest box we make!
Interior dimensions are 18.5" x 18.5" x 30.5"
Left or Right mounted boxes are determined by which side of your habitat the box will be mounted if you are standing in front, facing the habitat.
We refer to the front of the box as the side the entrance hole is located. The inspection door on this box is on the side that will face towards you if you are standing in front of the cage.