I was called to a home to replace a cross over duct that was completely smashed. The duct was made of thin metal and had been damaged by a tree branch that had fallen on it. I removed the damaged section and replaced it with a new piece of duct that was the same size and shape. I then sealed the new duct with duct tape and insulation to ensure that it was airtight. The homeowner was very pleased with the work and thanked me for my help.