Went out to a potential duct cleaning job for Mrs.Harris. Arrived to job site and introduced myself to Mrs. Harris and started inspecting soon after. Mrs. Harris was telling me that she just had her new unit installed recently but when they turned on the unit, one vent in one room of the house, blew out a bunch of dust. I asked her if I could go up to the attic and kinda inspect and see what I can see up there before I check inside. Once I got up to the attic, I inspected the Plenum and the ductwork. The ductwork is with the original home, Mrs. Harris said that the house was built about 19 years ago. I inspected the Plenum and tug tested to make sure that all the ducts were intact with Plenum. I also noticed that there was barely any insulation in the attic space, so I mentioned that to her later on. I come back inside and inspect one vent on one side of the house, and another Supply vent on the other side. I took pictures and showed her after what I had saw. The ductwork was surprisin