Hotend Cooling Fan Airflow Direction - Does it Matter?

Does the direction of air flow from the hotend cooling fan matter?

The sticker on our Mosquito fan should face the hotend, with the air flow directed toward the heat sink.

If you are using a dual-extrusion setup where the two fans are in line with each other, then they will need to be oriented in a way where one fan is blowing onto the hotend and the other one is exhausting the air.