Ventilation Tools
Tools for evaluating industrial ventilation and estimating the airflow needed to control workplace exposures.
Basics
Energy Balance
Track static, velocity, and total pressure between two points in a duct system.
Open the tool →Hood Types
Booth
Calculate the airflow a booth needs from its open face area and target face velocity.
Open the tool →Canopy Hood
Calculate the airflow a canopy hood needs from its perimeter, height above the source, and capture velocity.
Open the tool →USEPA Method 204
Calculate the airflow an enclosure needs from its openings and target face velocity.
Open the tool →Plain Opening Hood
Calculate the airflow a plain opening hood needs to reach the target capture velocity.
Open the tool →Flanged Opening Hood
Calculate the airflow a flanged opening hood needs to reach the target capture velocity.
Open the tool →Plain Slot Hood
Calculate the airflow a slot hood needs to reach the target capture velocity.
Open the tool →Flanged Slot Hood
Calculate the airflow a flanged slot hood needs to reach the target capture velocity.
Open the tool →Plain Multiple Slot Hood
Calculate the airflow a plain multiple slot hood needs to reach the target capture velocity.
Open the tool →Flanged Multiple Slot Hood
Calculate the airflow a flanged multiple slot hood needs to reach the target capture velocity.
Open the tool →Hood Performance
Coefficient of Entry
Calculate a hood's coefficient of entry from its actual and ideal airflow.
Open the tool →Hood Static Pressure
Calculate hood static pressure from velocity pressure and hood entry loss.
Open the tool →Ducts
Junction Resultant VP
Calculate the resultant velocity pressure where two duct branches combine.
Open the tool →Fans
Fan Total Pressure
Calculate fan total pressure from inlet and outlet total pressures.
Open the tool →Dilution Ventilation
Air Changes per Hour
Calculate how many times per hour the air in a room is replaced, from airflow and room volume.
Open the tool →Effective Ventilation Rate
Adjust actual airflow for incomplete mixing using a mixing factor.
Open the tool →Dilution Air
Calculate the dilution airflow needed to keep a contaminant below a target concentration.
Open the tool →Concentrations
Concentration Buildup from Zero
Estimate how room concentration builds over time when starting from zero.
Open the tool →Concentration Buildup or Decay with Generation
Estimate how room concentration rises or falls over time while a contaminant is being generated.
Open the tool →Steady-State Concentration
Calculate the equilibrium room concentration from generation rate and airflow.
Open the tool →Hummel Generation Rate
Estimate a contaminant generation rate using the Hummel method.
Open the tool →More tools will be added as they become available. Use results alongside professional judgment and your workplace requirements.
Built by OEMS to support practical, science-based workplace health decisions.