For duct opening size: 4x14 inch. Overall size: 15.79 x 5.51 inch. Solid oak wood products have slight texture and color changes. A few products will inevitably have slight tree knots on them, which do not affect internal structure and use. It normally surface mounted onto the duct opening of flooring, it sits on top of floor surface, the height of on-top part is 0.4 inch.
