Computer Fan with AC Plug, 120mm Variable Speed Axial Muffin PC Fan with Controller 120V 110V 220V Small 12V Case Cooling for PC Server Cabinet DVR TV Router Receiver Xbox Greenhouse

That's what I use. https://a.co/d/02W1R8cs

Here's how I did it: https://www.ajawamnet.com/oilhtrfanmnt.jpghttps://www.ajawamnet.com/oilhtrfanmnt2.jpgThermal image here - https://www.ajawamnet.com/20260124165725-IR.jpg120mm muffin fan, a beam clamp, (2) #8 spacers (0.2" length to clear the finger guard), and some 1-1/2" aluminum flat stock from Home Depot.These fans come with the finger guards and a variable speed control that has a 120VAC to 0-12VDC outputhttps://www.amazon.com/dp/B0BG4C9H5P?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1