This is how to determine the outdoor air cfm without an airflow monitor. In this HVAC test example, we calculate the Outdoor Air (OA) CFM by knowing the outdoor air temperature, the return air temperature, the supply air temperature, and the supply air CFM. #hvac #hvactechnician #hvaclife #hvactech | Tony Mormino
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This is how to determine the outdoor air cfm without an airflow …
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🔹 CFM in HVAC (Cubic Feet per Minute) In HVAC design, CFM (Cubic Feet per Minute) is the measure of airflow rate – how much air passes through a space or duct in one minute. It plays a vital role in comfort, cooling, heating, and ventilation. ✨ Formula: 👉 CFM = Velocity (FPM) × Area (ft²) 🔸 Example: • Room Size = 12 × 10 × 9 ft → Volume = 1080 ft³ • Required ACH = 6 • CFM = (ACH × Volume) / 60 = 108 CFM ⸻ ✨ Quick Conversions: • 1 CFM = 0.472 L/s = 1.699 m³/h • 100 CFM = 47.2 L/s = 169.9 m³/h
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