I wanted black, it was sold out. I ordered green, black was back in stock a week later. I thought there were four vents, there are only two vents. This is the only reason I ordered it. Does anyone know if they sell extra vents? Wish the description was more specific. My dream purchase has become more of a let down. Will update after we have actually used it. It really takes a long time and two people to assemble, be patient.