VANNEX MASK are made in Hong Kong, the factory is located in Sheung Shui, New Territories.
What is a clean / no dust room?
The clean / no dust room is a special room that controls the particles, harmful air, bacteria, etc. in the air. As well as the temperature, humidity and pressure within a certain range.
To build a clean / no dust workshop, ceilings and walls shall be laid with aluminum alloy color steel plates, and epoxy resin shall be laid on the ground to achieve the effects of dustproof and antistatic. In addition, a fresh air intake system must be built in the clean / no dust room. A positive indoor pressure which greater than the outdoor pressure should be established. So that the outdoor dust or particles will not be sucked into the indoor space.