Airlock Leakage Flow Calculator (ASHRAE Standard)
Cleanroom Air Balance & Pressurization Simulator
Accurately calculating air leakage through door clearances is the absolute foundation of cleanroom pressurization and GMP compliance.
In high-stakes pharmaceutical and heavy industrial facilities, maintaining strict environmental control requires precise air balancing. The required pressure differential is achieved by meticulously calculating the difference between the Supply Air entering the room and the Return Air leaving it, ensuring the exact necessary volume of air is forced through structural gaps to prevent contamination.
How to Use This Tool: Enter your target values and specifications to simulate the system dynamics. This tool instantly calculates the resulting leakage exfiltration rate and visualizes the room's pressure condition, ensuring your HVAC system is perfectly sized to maintain complete containment and pass inspection the first time.
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Deep Dive: Want to understand the engineering logic behind these pressure targets? Read our Technical Guide to Bubble, Sink, and Cascade Airlock Design
Airlock Leakage Flow Calculator
Calculate exfiltration airflow through door clearances using the ASHRAE sharp-edge orifice derivation.
+15 Pa
0 Pa
Volumetric Flow Rate (Q)
Q = 840 · A · √ΔP and incorrectly label the output as CFM. Mathematically, using metric inputs yields L/s. CED strictly converts to exact CFM to prevent design deficits.