They do not go into the fridge.
The fridge (4 to 7 deg Celsius) is only meant to prolongedly store prestored mature bulbs in order to delay the further elongation of scapes out of the bulbs, which would require immediate potting up and forcing respectively.

For Winter storage of bulbs, no matter whether bulblets or mature bulbs, temperatures of 9 to 17 deg Celsius are appropriate. perfectly 13 deg Celsius, at least for mature bulbs, at which temperature the preformed scapes within the bulbs elongate with maximum speed.