Medical question

Hi everyone. I’m not sure where to ask this question but it’s something medical.

I work in ICU as a nutritionist and there was someone next to my patient in ICU who was intubated and on life support but had a yellow sign on their door that said “flonan in use” and to proceed with caution.

Does anyone know what Flonan is? Usually we have pink blue and green signs stating COVID positive patients and aresol warnings.

Just curious as I’d like to know for my own knowledge.

Thank you.