When we returned to our house after a hurricane, every fan blade inside was drooping. That wasn’t surprising. It had taken two weeks for the power to be restored, and without air conditioning for that ...

4-blade fans are designed to offer a good balance of airflow and quiet operation. With four blades, these fans can move air efficiently while creating less noise compared to fans with more blades.

GKN Aerospace is seeking certification for a new fuel-saving fan blade coating that when applied during the repair process leaves the part “better than the original”. Tests of the proprietary ceramic ...