Reddit mentions of Dell DELL-3424P-FANKIT 5x Quiet Replacement Fans for Dell PowerConnect 3424P (UJ599, Y4654, WJ684) 18dBA Noise

I considered Noctuas but Dell does this funky thing there they rewire the connections from the standard 3 pin connector and you’ll get a fan failure light and they won’t turn on if you don’t rewire it yourself. I just lacked the tools to do the rewiring so I opted for a Sunon kit which already had the proper connector and came with extenders (I’m not confident the fan cables would have been long enough on the Noctuas). A bit pricey but well worth it after installation. Ships pretty quick from California even without prime. I’m on the east coast and had them in 4 days.

https://www.amazon.com/dp/B00XI478SW/ref=cm_sw_r_cp_awdb_t1_foxXDb3BG4KNE

Noctuas would have been cheaper for sure (I think they’re $15/ea or so, but if I needed to require the connectors I’d also need one of these so my options were $95 prime to do it myself, of $99 + shipping to buy what I knew would work plug-and-play.

I swear half my homelab experience has been buying stuff super cheap and then pouring more money than its worth into getting it working the way I want it. I guess you learn stuff doing these upgrades yourself though :)