Thanks for the tips. I'd need probably about 30 X 30 cm to be safe. Our dump won't let us take parts off things. You have to buy the whole thing from the Lifeline Shop next door and they charge like a wounded bull.

I wonder if the front loader washing machines would have good enough ventilation? The holes need to be around 4mm diameter and fairly closely spaced, like the old Briggs & Stratton screens.
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