The new redux edition NF-P14S 140mm fans feature a square frame, superior airflow, an industry grade SSO bearing, an MTBF rating of over 150,000 hours and a 6 year Noctua warranty. The NF-P14 redux are a proven premium choice that provides trusted Noctua quality at an attractive price point. The extra slow 900rpm version is ideal for ultra-low-noise applications and highly noise sensitive users who demand near-silent operation.

Xtreme Systems User Review
"Simply put, Noctua did a splendid job and it's clear that all five are premium products, because they can barely be heard even with an open case and they perform excellent." Full review