💡 Many homeowners use a "trunk and branch" system—rigid sheet metal for the main trunk line and short flex runs for the final branches to the vents. 3. The Budget: What to Expect
Prone to kinking and sagging; shorter lifespan (10–15 years). Built-in insulation, very quiet operation. Rough interior traps dust; high mold risk in humid areas. Fiberglass Lined Excellent noise reduction and thermal control. Hard to clean; fiberglass can deteriorate over time.
Before buying a single foot of material, you must determine what your home actually needs.