Mschem,
That fume extractor is AWESOME. Exactly what I need to add. Where did you get all the pieces for it?
Thanks -Dan
The blower is a "mini" dust collector from Harbor Freight, China, 1hp 7A 125 VAC. Supposed to be 660 CFM. It's just enough, I'm running it through 4 inch steel galvanized duct. I cut a hole (4 inch?) through the end joist and bought a heavy gauge steel dryer vent with a decent weather flap and a open screen to keep the small mammals out.
The collector/ plenum thingy is a rainwater collector for driveway drains. It was on clearance. Because, who in their right mind would use plastic instead of steel. It's 3 feet long, bought a short piece of drainage pipe and a elbow. I am done smelling toner or stinky fixer. I use pretty low odor fixers and citric acid stop. But there's no getting away from even selenium toner, and sulfide is horrible. I poured 28% acetic acid into a small tray, couldn't smell a thing. I had a little Doran fan before the big blower it worked but was not enough.
I have two 6 inch air returns from the main floor of the house for make up air and the collector adds some restriction which is just about right. My darkroom is a very large utility room, has furnace. The furnace has a powered exhaust, you need to be careful, there's a pressure cutout switch on the furnace which can trip turning off the heat.
I haven't had any problems. Blower was around 150 usd, rest of the parts around 50-60. I saw the pieces at the store and a light bulb came on. Worked out better than I expected.