I need to remove a 2-foot section of ductwork that got flooded so that I can rip out the internal insulation, but I don't see an easy way to remove the drive cleat since there is only about a 3/4" of clearance, and the cleat foldover looks like about a 1.5" from what I can see. I can probably remove some of the drain pipes that is in the way but it would be a major task to remove the boiler that's already been set up with gas pipes and whatnot. This means that the cleat is crowded on both sides with a brick wall on one side and a furnace on the other side blocking the slip off.
Is there a way to pull the drive cleat off perpendicular to the duct with some prying, and get it back on with a lot of hammering, or is it a lost cause?
My plan B if I can't get this off is to cut an access hole and then use a duct insulation sealant like IAQ 8000 to seal the whole thing, but it seems like a pretty expensive sealant and would require spray equipment and some expertise.