Unlike other cake recipes, the Lemon Chiffon Cake should be cooled upside down. This allows the pan to give the cake extra support as it cools and gravity helps it to maintain its height. If you were to cool the cake right-side up, it's delicate structure would be in danger of collapsing. Once the cake has cooled, it is nice and sturdy. Some tube pans are designed with legs, with the upside-down cooling process in mind. This is especially helpful if your chiffon cake bakes up taller than the pan.