Hi Malte, Thanks. Yes, I saw the datasheet. Unfortunately it's an obsolete fan and Nidec doesn't seem to have a replacement in their newer lines. However the 4 wire version model E34386 with speed sensing has similar characteristics and there are several on eBay. Looking at the fan curves however, The E34386 doesn't do as well at the same pressure drop as the M33402. Sun Lunch boxes are already pretty strapped for adequate cooling so I'd rather get something a little stronger while not exceeding the M33402's 140mA rating too much. I did happen to find a vendor who sells the M33402 but the description was a bit ambiguous and I'm still waiting on confirmation that it's the same fan. http://www.nidecpg.com/fanpdfs/ta225dc.pdf On Mon, Sep 13, 2021 at 2:00 AM Malte Dehling <mdehling at gmail.com> wrote: