| Respiratory protection in the lab... | ||
 |
... is not typically accomplished by PPE. Instead it's done with general and local exhaust ventilation. | |
| Respiratory protection in the lab... | ||
|
... is not typically accomplished by PPE. Instead it's done with general and local exhaust ventilation. | |
| General exhaust ventilation |
Air is actively brought into and removed from the room, including labs (air diffuser and air return are usually in ceiling). Removed air is at least partially recirculated to all rooms on that AHU (so ) |
| Local exhaust ventilation |
Chemical Hoods are an example of local exhaust ventilation. Face velocity should be 80 - 125 linear ft/min, and the hood should be as free as possible from clutter and unnecessary items which can cause extra turbulence and restrict air flow. Sash height in many hoods will affect face velocity. |