Cooler to cage fan. This cooler attaches easily to burgallret. When the fan draws air into the cage is pulled through the coolern which is then cooled. To burfläkten works if you have a Coller as one camp in the freezer before use. Buy therefore like two, so you always have an active available. Keep your cooler in the cooler with ice packs. before you use it, for example. dog show or when you go to the car.