Found this during the home inspection, but ventured into the crawl space and took a closer look today.
The first pic shows a blower (ducting is feeding from the right) that was stuffed into the existing main line, would feed 3 registers in the downstairs family room. Ran off an extension cord (no longer present). As you can see, the ducts to the family room are not currently active.
The second and third pics show where the ducting used to come off the main and spur off into the downstairs bedroom. They put this blower here instead, again to be powered with an extension cord.
Any ideas what they might've been thinking?? There used to be a wood stove in the basement if that has any bearing.....