Step 1: Thermacol Box 2 Nos
one box has a 12 volt dc fan attached to it. second box has copper tubes.
Step 2: Second Copper Coils
one end of copper coil takes air from outside the box and other end of the coil ends in box with fan
Step 3: Fan and Coil
copper coil ends and fan, fan creats suction in the box when box is closed.
Step 4: Coilbox
put freezing mixture in it and close the lid. copper tubes take air from outside the box and drop in box with fan.
Step 5: Freezing Mixture
a mixture of salt and ice.