We ran across this on a home energy audit. Needless to say we stressed the importance of new equipment not only to get this just out but to install new plenum and return drop. Static pressure is 1.0 furnace and ac oversized 80K and 3 ton ac that doesn't work for a 1200 sq ft home. The homeowner actually said a business installed this which I could not believe I thought this was side job bob all the way. Hopefully she lets us turn this turd into a work of art.