They are great for making small heated incubators on the microscope stage for live cell imaging. Make a plexiglass box with one of these (you'll need to cut out the curved plastic fan face first), add a microcontroller (I like the PIC18F2455) and a TMP275 temperature sensor for feedback, and you have a simple incubator at the top of the stage. The fan and heater draw about 4A, so you need a relay for the uController to turn them on and off.
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