The Magic Box Formula — Understanding Total Flow Ever wonder how much flow your patient really gets from that 35% Venturi mask? Let’s break down the “Magic Box” formula step-by-step! 💡 This quick explainer will help you master air-entrainment ratios, FiO₂ calculations, and total flow delivery — all key topics for the NBRC TMC Exam. By the end, you’ll know exactly how that 6 L/min on the flowmeter translates to 36 L/min total flow to your patient. 🫁 #RespiratoryHQ #NBRCPrep #VenturiMask #AirEnt
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