This air vent extender attaches to floor vent covers and directs forced air out from under furniture and into the room. Use under couches, chairs, beds, dressers, and more and can extend up to 35 in. . With one of these vent diverters under your furniture, you can be sure that the heat coming from the furnace is being circulated as effectively as possible. Putting one of our floor vent extenders under your furniture means you won't need to crank the thermostat. Nor do you have to move couches around the room to have the most efficient distribution of warmth throughout the space. This saves you time and labor as well as gives you the potential to lower your heating bills.