I know this thread is quite old but posting here because this was one of the resources that I used when planning my recent darkroom build (discussed in this thread). I opted for the pvc pipe with holes that the OP originally asked about and after some testing, I found that the system was not effective for me. I’m using a 1202 CFM blower (so plenty of power and suction) but in the end, the pipe with holes just wasn’t able to create enough suction across the surface of the sink to adequately remove fumes/vapor per my tests using smoke from incense. I’ve posted this video which shows the smoke test and the change to the plan that I arrived at which does draw fumes (smoke in my test) off the surface of the sink from an adequate distance. Just posting this here for others who might find this as they decide what kind of system they want to use. Hope it’s helpful.
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