In a horizontal laminar flow hood, where does the air flow originate?

In a horizontal laminar flow hood, the airflow originates from the back of the HEPA filter and moves toward the work area in a laminar flow pattern directed to the DCA (Direct Compounding Area). This design ensures that air passes through the HEPA filter to remove contaminants before flowing over the compounding area, creating a sterile working environment.

The HEPA filter captures airborne particles that could potentially cause contamination, and by pushing the filtered air from the back towards the front, the hood maintains a sterile zone where preparations can be made safely. Understanding this airflow is crucial for ensuring proper aseptic techniques in pharmacy compounding, as it helps minimize the risk of contamination during drug preparation.