Symbol 1597 from ISO 7000 - Title/Meaning: Cleaning fan 
Function/description: To identify the control for the cleaning fan. To indicate the operational status of the cleaning fan.
Own work using: iso.org/obp/graphics/grs/a71958b2-f012-4ae2-a448-c0388e12e2a1 200.png
Vectorization:  Mrmw