A new design with much greater performance!
Below are some of the sources for parts I used.
50 Ohm / 450 Watt Flange Mount Resistors
https://www.mouser.com/ProductDetail/620-G450N50W4
HP CPU Fan/Heatsink
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p4432023.m570.l1312&_nkw=HP+711578-001+CPU&_sacat=0
70mm Fan Grill
https://www.amazon.com/Noctua-NA-FG1-7-Sx2-Grills-Black/dp/B0B1VLXLX8/ref=sr_1_3?crid=28CPSAQH2PLTE&dib=eyJ2IjoiMSJ9.YlMhO8HKqP8wfdZoyFI63MfGlcgkiRPC-zO5aycngpf0JZu-UwNcuF6pDZ5gW8b3aRhF_lu9KmVPoJJuEOt6LNvDKnIMm0lZ41nvtXM0AJC_ygyjylB5QGROkgBoGpaUsVKz3tKlT_67DfMn8Jodo9kcfl1BYmpWwmNzf4XkKrWsI62UFfMu_IBGLJrtkpS_4wolJRaHNopyiDW4pXUlTQZ7bD5e04-FI9rMUt0uiJ8.cR-5gXDrIBQRuu37K2CZX_eYLYZ3AdjCPF-biDZTvu0&dib_tag=se&keywords=70+mm+fan+grill&qid=1724545013&sprefix=70mm+fan+grill%2Caps%2C145&sr=8-3
Temperature Switch
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p4432023.m570.l1313&_nkw=ksd-01&_sacat=0
9 Volt Battery Holder
https://www.amazon.com/LAMPVPATH-Pack-Battery-Holder-Switch/dp/B07T83B4SW/ref=sr_1_1_sspa?crid=3SKWDQZNH7NUD&dib=eyJ2IjoiMSJ9.zRXEgi4yWfomn6nK7Ij-DPjX2xbgOBHTCdCSigr7ihywQUKqby68Ji9SqpQIb41MHNbPBiFNm8AmGfSrQ0zIGvw771ddhUeoioX4swjEKZSGDZIUtmp4Qhg04tj5lyaSr_b3OX46AeeWs1FO3wikclAyobnFsdo7VnPhuurSnc8ISXe138WnT6HGpFTsS0-sgXUXpCb1Eu6NaEQPnOToBe5ixPPD7UwrSVrnD3WIo8A.hWrPKMdJsIexufZdrqyM0hJlDq5VMomYxPVGxnyjQsU&dib_tag=se&keywords=9+volt+battery+holder+with+switch&qid=1722460682&sprefix=9+volt+battery+hl%2Caps%2C157&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1
9 Volt Rechargable Battery
https://www.amazon.com/Quzmo-Rechargeable-Lithium-ion-Multimeters-Walkie-Talkie/dp/B0CRYS8NYH/ref=sr_1_38?dib=eyJ2IjoiMSJ9.cEZnn1YZw9BvOkaWPQtAURTu01r4O5FAWpMbsHUpmjHGQvWCO1VuevpA6LTRUbwLPsI50NI3FnyxlhnhnlRiFpDPtsuvA7FgHIU8ZQ1jVU_oSRim8jA6-BTbELzKXYtcBOIzNS6eOIpcN3cbL18AardEpXSPatY4gTvDAeYO8NIurWU65_nRmiKpn6XYk0TqoIDzY8JYP33SsFKDTaN-O3Rup4ZwAw22MWx0jjMEk0sU4E9oWZ5ZlKpJtAkGppA-Yz1ehgMSTPjCAkLrj0WW9KQI430ErQVaYGpToIkoap0.svWl3QCfyw-MuM9R7HDW98LJd3S968CjUp6opabvKdE&dib_tag=se&keywords=9%2Bvolt%2Blithium%2Bbatteries&qid=1722625501&sr=8-38&th=1