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In this video I clean the coils in a refrigerator where the coils are impossible to clean with a brush. Modern refrigerators have coils that are not designed to be easily cleaned (this annoys me).
I should have mentioned in the video how to use a box fan with a filter. Box fans are not meant to be use with a filter. Adding a filter increases the static pressure and make the fan work harder and heat up. I have used this set-up for several hours straight but I never leave it running when I am not in the room. This fan is very robust and about 40 years old (made in the USA) they don't make them like this anymore.