You are caring for a 2 yo with multifocal pneumonia who is hypoxic on standard nasal canula. You decide to institute high flow nasal canula (HFNC) in an effort to stave off orotracheal intubation. Your repspiratory therapist requests parameters including flow rate (typically 0-40 LPM). What is the optimal flow rate to decrease work of breathing in this pediatric patient?