What way should a fan face when mounted on a CPU cooler? - Quora
What is The Proper CPU Cooler Fan Direction? [Read this!]
SilverStone Malaysia - FHP141-VF is the high pressure 140mm*38mm fan with reversible air flow. You might change the airflow direction easily and also included the long-life dual ball bearing motor inside.
Fan orientation for optimal airflow? : r/buildapc
How To Tell Which Way A Fan Blows
How to determine the airflow direction of your case fans? | Cooler Master FAQ