Aerosol Mixing Through A Fan
Although a common belief, injecting an aerosol upstream of a fan does not necessarily result in adequate mixing downstream. Many fan designs do a poor job of distributing the aerosol from a single injection point. Multiple injection points upstream of a fan will assist in providing the required aerosol uniformity for testing.
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HEPA/ ULPA Filter Certification Testing Products:
Airflow Visualization Products
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New Bern, NC 28560
Airflow Uniformity Across A HEPA Filter-Various Airflow Conditions
A great deal of focus has been placed on maintaining airflow velocity uniformity across the face of a HEPA filter. The video shows that even with a sharp transition from high to low airflow velocity, the airflow patterns are not significantly disrupted (e.g. heavy reverse airflow or lateral shifts) Airflow patters are shown for multiple flow conditions.