Local Exhaust Design Calculator
Calculate required hood airflow, duct size, and face velocity for local exhaust ventilation systems using ACGIH capture velocity principles.
Inputs
Results
Required airflow (CFM)
975
Face velocity (fpm)325
Calculated duct dia. (in)7.1
Standard duct size (in)7.5
Actual duct velocity (fpm)3,178
Hood entry loss (in. wg)0.59
Required M3Hr1,656.53
How to Use This Calculator
- Enter Capture velocity (fpm), Distance to source (ft), and Hood width (ft).
- Set Hood height (ft), Flanged? (1=Yes, 0=No), and Design duct velocity (fpm).
- Review the Required airflow (CFM) result.
- Use Face velocity (fpm) and Calculated duct dia. (in) to inform your decision.
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