The 3 things I learned when I had my foundation repaired that shocked me: slab movement can pinch ducts

https://www.4shared.com/office/qFbeK1nUku/pdf-22676-9960.html

The 3 things I learned when I had my foundation repaired that shocked me: slab movement can pinch ducts, HVAC balancing after lift is smart, and filter dust loads spike.