I was going to wait for Brian to respond, but he has not yet. I think what he is talking about is the Oneida foam drop-in thing here:Originally Posted by mark mcfarlane
https://www.oneida-air.com/dust-coll...ilter-silencer
It is about 1 foot tall and basically hangs a 1/2" thick foam around the inside of your filter. It's meant to help reduce sound sound (Oneida states 2-3db), but I did not use this and I don't know that it would help that much. 1/2" of foam doesn't do a whole lot here inside the filter itself.
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