I bought this one, but I and then an extra standalone fan, to have neutral pressure in my network closet, and it has never gone above 30 Celsius.
AC Infinity AIRPLATE T7, Quiet Cooling Fan System 12" with Thermostat Control, for Home Theater AV Cabinets https://a.co/d/0jgj41Ie
You are a superhero, one of the likes we rarely see.
God bless you, your work has returned some hope on humanity for many of us.