You definitely hear mine running, but you hear an oil furnace running too. This way I get some of those sweet sats with my heat.

I got a 3d printed shroud and fan adapter card from njord (both from dcentral though the canada post strike might make that a bad source today) so I can use an 8" ac infinity fan. Urlacher mods only work on a very specific s19 sub model that I don't have.