This is for one floor vent. It is great if you heat with a wood stove and want to allow the heat to rise up into your upstairs rooms. If you are worried about your floors, you can put the hole in your closet and put this vent over the hole. This is also the proper size to use when running air ducts for forced air heating systems or running ducting for your wood stove air to heat your upstairs. It is about 8" by 10" overall and made to fit over a 6" by 8" opening. Asking $10. If interested, please email me or call me. No texts as this is a land line.