Not sure I'm connecting this sound dampener correctly

I bought a sound dampener for my Ventilation system. Right now I have my carbon filter connected to the van by a short piece of duct. I have a slightly longer piece of ducting going from the fan, which is set up as an exhaust fan, to the dampener. Connected this way doesn’t seem to make a difference in noise, so I think I might have something connected wrong.

Hopefully someone can shed some light.

What are you trying to do? “Mufflers” only knock down air movement noise by a bit; they don’t do anything for fan motor noise. If you’re looking to knock down air movement noise, try some insulated ducts.

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