Screech Owls prefer abondoned woodpecker holes or neglected nests.
They will readily take boxes lined with an inch or so of wood shavings.
Our house is all Cedar with a 3 inch opening, vented and features
a side clean out panel. Suggested mounting height: at least 15 feet
up on a tree trunk.
Overall
Size: 9" Wide x 21 1/2" High x 9 1/2" Deep