Had an NH-D15s, got a second NF-A15 fan, slapped it on, and now it's complete. I mean, who even needs watercooling when you have this beauty? <3 : r/Noctua
Noctua NF-A15 PWM 140mm Cooling Fan (Round Frame, Brown) 166678
Noctua NF-A15 PWM review -
Noctua NF-A15 PWM review -
NH-U14S Ultra-Quiet Slim CPU Cooler with NF-A15 fan
Noctua D-Type Premium CPU Cooler, x 2 PWM Fans - Newegg.com