For duct opening size: 4x14 inch. Overall size: 15.79 x 5.51 inch. Please kindly read size chart in listing carefully before you buy it. Solid oak wood products have slight texture and color changes. It is difficult for us to guarantee that the products you receive are exactly the same as those shown in the pictures. 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. More fin structure with louvered design facilitate airflow go through the wood vents stable with two direction. The sliding damper, which move back and forth on backside, is easy to control the airflow, and can be removed from the wood vents by bending two tabs on itself. Highly recommended that the floor register not to be installed in high traffic area. Hardwood drop in floor register is heating and cooling register grille and vent cover with louvered design. It is a kind of wood register with self rimming edge and no frame. This kind of wood floor register can drop in duct opening easily, and it normally surface mounted onto the duct opening of flooring, so we also called it surface mount floor register. This kind of wood vents are not recommended to be installed in high traffic area.