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I wasn't aware of issues with Provent 200, I installed mine a few months ago and its been working really well extracting oil out.
Dougal pioneered it as far as I know, I recently did a ghetto fab version with a Dremel and a zip tie. Basically it’s reversing the flow and removing/locking open the back flow valve so it will operate in reverse.What is the modification you made? I’ve seen a few people mention it but unsure what’s done... is it just reversing the flow direction?