Aerotech® 24" Fan, 4 blade with 1/2" bore

Aerotech® 24" fan 4 blade with 1/2" bore, 28 DEG, w/Set Screws
Diagram 1 - (part #3)
Diagram 2 - AT fans (part #2)
Diagram 3 - VX Fans (part #3)

*****Incorrect Picture is a 3 Blade fan********