This showed up maybe two weeks ago? If it is somebody’s please claim it. 
If no one claims it, it will be going away in a month!
Thanks,
Jon
Jon that was donated by Nancy for an upgrade to the dirty room vent system.
Yes, I think it is the one out of my old furnace, which means about an 800sqf house, I offered it when they were talking about better venting in the dirty/welding room. Daniel also pointed out one on top of the lounge ‘roof’ that might also be used.
I do not know enough about ducting work to do it alone, but I planned on seeing on if I could find assistance to install one or both in the dirty room.