You don’t need inuslation when one duct blows directly into the basement, and two floor vents are hanging loose and also blowing into the basement, one duct was insulated, asbestos, insulation in this case would be an unnecessary expense.
The furnace was sitting on two concrete blocks, and notice the exhaust vent in contact with the CSST, preheating the Gas must make the furnace more efficient.
As far as the CSST class action, I informed my clients of that, but to me at least some effort to follow the manufacturer’s installation guidlines should have been attempted.
This is typical of home in this area, Mullan is an old mining town, pop. 450, most of the houses were built in the 20’s for Miners, it’s also an area where Code enforcement and permits are not a big priortity when it comes to renovations.