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The measurement of airflow across the opening of a local exhaust capture hood.
Transport Velocity
The amount of airflow required inside a duct to keep a contaminant entrained throughout the
system.
PPE
Creates a physical barrier between the worker and hazard. Last resort.
, Volumetric Flow Rate
Measure of air flowing through a point in the system.
- Q=AV
Static Pressure
Potential energy of the ventilation.
Velocity Pressure
The pressure required to accelerate air.
Total Pressure
The sum of velocity pressure and static pressure.
Inlet
Where the air is drawn into the hood, which captures, contains or controls the emission
source.
Duct
Carries the contaminant to the air cleaner and then to the outside area.
Air Cleaner
Scrubs, separates, removes, or filters the contaminant from the air.
Fan
Generates static pressure and moves the air.
Outlet
Disperses the cleaned air into the outside environment.
Static Pressure
Vent systems potential energy exerted in all directions.
Friction Losses
Rubbing of air molecules against sides of duct.
Dynamic Losses
Air pressure losses caused by changes to air movement and turbulence.
Vena Contracta
Point where the air stream is the smallest.
Contractions
As air moves from a larger to smaller area, it will contract as it passes through the opening.
Make-Up Air