Wood Duck House. This is one of our largest houses and is designed to provide the woodduck with the proper nesting cavity. This is one of our largest houses and is designed to provide the woodduck with the proper nesting cavity. In addition to a 3" x 4" oval entry hole and side clean-out, a 6" hardware cloth strip is stapled to the inside front providing a climbing aid for ducklings. Made of Inland Cedar using Zinc-Chromite screws & hardware with Brass Hinges. 11"x8"x24"H.