Suddenly, in the cramped boiler room, a pressure-relief valve opens and discharges steam. Then, a certified technician approaches to perform a routine check. But, is he wearing his factory mask?
Overview：Suddenly, in the cramped boiler room, a pressure-relief valve opens and discharges steam. Then, a certified technician approaches to perform a routine check. But, is he wearing his factory mask?
![FACTORY MASK [12/2001]](https://i.ytimg.com/vi/DpRMe2n4AuQ/hqdefault.jpg)
