This mod moves the three part fans on the HE280 in and up above the hot end. The point of this mod is to allow a narrow enclosure. The stock part fan layout moves the fans considerably outside the base frame when the head is near the bed limits. This allows full travel with a narrow enclosure.
Airflow is a bit less, but better directed. You still will not need to run the fans at 100% in my experience.
You will need to trim the small plastic tabs on the effector plate before installing the shrouds.