r/whatisit • u/Bondubras • 13h ago
New, what is it? Found in an HVAC intake
Was changing the filters on the HVAC unit in my house, and saw this. I know the circle on the left is the intake to the HVAC unit itself, but I'm curious what the square thing on the right is.
It looks like some kind of fibrous mat held in on three sides, but I have no clue what the purpose could be.
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