How do you get past the fan on shrink ray island on poptropica?

Going right, jump on the fan and it will lower down. You can turn it on to blow the dust under the bed.

Coming back left from the computer : jump up on the computer desk and reach the thermostat on the wall. Run on it to turn it to the right until it reaches the "red zone" (the room heater comes on). When you reach the bed, dump over the wastebasket and various pieces of paper trash will be blown up in the updraft from the vent. You can climb on them to reach the bed. (Don't forget to check out the Morse Code book that is there.)