Looks like an old rusted railroad spike (?)Success! I was able to drive the object out with a large crow bar and a 20 oz framing hammer. Took a dozen or so blows but all is free and the blower is ready to be reinstalled. I say object because I'm still wondering what it is and where it came from. It appears to be cast iron but it's pretty rusty and corroded. It almost looks like a tools hank of some sort. All I can say is of all the dumb luck, the odds of something like this happening must be about a million to one. Here's a picture of "the thing". [
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Or maybe a piece of an old iron railing of some sort. Maybe your construction crew lost it off their truck.