I had to remove the bottom foot of internal duct insulation touching the ground due to sewage backup.
Now that there is a frayed edge of internal insulation inside the ductwork with the remaining insulation continuing above the flood water line. Is there something I can use to prevent loose fiberglass fibers from this border from going into my return airflow?
I saw that there are some insulation edge sealing sprays, but in this case it's not at the end of a duct but in the middle. Can I tape down the edges with a mastic foil tape, or does that not work because it wouldn't stick to the insulation?
What's the easiest way to seal the frayed fiberglass insulation border in the inside of my return duct?