Measured it: https://www.jefftk.com/p/framery-phone-booth-co2-accumulation https://www.jefftk.com/p/framery-phone-booth-co2-accumulatio... It uses mechanical v

Measured it: https://www.jefftk.com/p/framery-phone-booth-co2-accumulation https://www.jefftk.com/p/framery-phone-booth-co2-accumulatio... It uses mechanical ventilation, and is fine as long as you don't unplug it.