How does a tumble dryer know its filter is full?

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Is it to do with the amount of air that can pass through it?

In: Engineering

You don’t mean like for the lint do you?

either air pressure or a photodiode with an IR led shining through the filter (that’s how it was solved on a projector I had)

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Excellent point. It’s quite a small drum too, which probably means it’s much worse for the environment!