I cleaned the fume hood with paper towels and DI water and set up the Vevor Ultrasonic Cleaner (internal designation MX-S24002) in said fume hood. I filled it with 4 L of DI water and turned it on for 30 minutes. I set the heater to 30°C and the temperature reached 41°C (at least). I am not sure why this is, but something to look out for.