𝐈𝐌𝐏𝐎𝐑𝐓𝐀𝐍𝐓 𝐍𝐎𝐓𝐄- All covers must be ORDERED BY DUCT OPENING SIZE! Do not measure your existing cover. If you are unsure about which size to purchase, please send us a message. Our products are made-to-order in the USA and are considered custom orders; we DO NOT take any returns or exchanges unless they have been damaged while shipping or have manufacturer issues. We are not responsible for the wrong dimensions given by the contractors or customers. P.O. BOXES will NOT be accepted. It is ¾" thick and designed to sit FLUSH on this sized hardwood floors. We also accept custom made orders to your specific thickness. Please contact us directly. The register comes integrated with a box unit that makes installation easy. Our registers DO NOT come with louvers or dampers box to control airflow.