What measurement are they using to where 34.8 m3/h comes out to 59.1 CFM? It can't be cubic meters, as that would only come out to 20.5 CFM Nor can it be cubic miles, as such a speed would be absolutely impossible to attain with such a small, quiet, and low power motor

It's Cubic Feet per Minute, so really CF/m.

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Noctua NF-A8 ULN, Ultra Quiet Silent Fan, 3-Pin (80mm, Brown)

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Model: ULN

PWM
ULN
5V PWM
5V

Ultra low noise fan, 80x80x25 mm, 12V, 3-pin Molex, 1400/1100 RPM, max. 10.4 dB(A), >150,000 h MTTF
Award-winning 80x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance
8cm format is ideal for compact PC cases (HTPC, ITX, Small Form Factor) and other chassis (intake & exhaust), replacement fan for NAS and other devices, etc.
3-pin ULN version with 1400rpm (1100rpm with supplied Ultra-Low-Noise Adaptor) for serious silent enthusiasts who demand the utmost quietness of operation
Includes anti-vibration mounts, fan screws, Ultra-Low-Noise Adaptor, extension cable and 3:4-pin adaptor for powering the fan directly from the power supply

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The NF-A8 is a highly optimised, premium quality quiet 80mm fan. Featuring Noctuas AAO (Advanced Acoustic Optimisation) frame as well as sophisticated aerodynamic design measures such as Flow Acceleration Channels, the NF-A8 further improves the renowned quiet cooling performance of the award-winning NF-R8. The ULN version provides super-slow 1400/1100rpm speed settings for ultra-low-noise applications and highly noise sensitive users who demand near-silent operation. Its superb running smoothness, reference-class SSO2 bearing and Noctuas trusted premium quality make it an elite choice for the highest demands.

Details
Fan Counts	1 Fan
Fan Controller	No Controller
Type	Case Fan
Compatibility	Case
Fan Size	80mm
Fan Thickness	25mm
Bearing Type	SSO2
RPM	Rotational Speed (+/- 10%): 1400 RPM Rotational Speed with U.L.N.A. (+/- 10%): 1100 RPM
Air Flow	Airflow: 34.8 m3/h (59.1 CFM) Airflow with U.L.N.A.: 25.6 m3/h (43.4 CFM)
Noise Level	Acoustical Noise: 10.4 dB(A) Acoustical Noise with U.L.N.A.: 6.5 dB(A)
Power Connector	3 Pin
Color	Brown
LED	No

Additional Information
First Listed on Newegg	January 24, 2019

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Item#: 9SIAADY4P65838