teak isle adjustable air conditioning vent cover teak isle this adjustable drop ceiling vent cover is ideal for office environments where everyone is always battling over the temperature. composed of 1/8" abs material, this vent cover is easily adjusted with your hand or pencil to allow each employee to control the temperature of their own workspace. individuals can close or open the vent to allow the perfect amount of air. it never fails that someone is always hot while someone else is always cold! reduce the bickering and give everyone control over their own workspace! the unit measures 23 11/16" x 23 11/16 and is designed to pop right into your standard 24" x 24" drop ceiling vent covers.