Mastic inside Ductwork – Beaverton HVAC Tips and Reviews

New Tip: Mastic inside Ductwork
Shared By Furnace Repair Financing Beaverton Experts…

Hey all I came across something rather odd today… I was at a house to evaluate the condition of the inside of the trunk lines. The installing company had applied mastic to the interior seams of all the ductwork. Every. Single. Place. the ductwork had mastic applied was rusting. Has anyone ever seen this or know why this has happened?

submitted by /u/SpermicidalTendency
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