Not too worried about the hepa part, I point the exhaust out the shop door into the larger space of the barn. When I eventually build the whole shop dust collection I’ll vent it straight outside. I think the bucket just gets too warm and the slightest dent will cause it to collapse on itself. I just picked up two new buckets and am going to try nesting them and see if the second outside bucket keeps the inner bucket from deforming and crushing in on itself.
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