Quick question. Is hanging flexible duct straps with nails bent over like the pics below typical or even to code? We had a new install of a HVAC and I called for and inspection last Friday - 3 pages of corrections with over 20 violations. This one wasn't listed but he couldn't get to the ducting because the furnace was in the way and didn't want to climb over it. I did today and saw this. It doesn't look right to me.