Would this make a good exhaust fan?

Very much so. I ended up using these for both intake and exhaust. It was a good fit as well to push through radiator as the air is very focused and pushes through well. I ended up trying three other fans (corsair brand) and found these to be worth the cost.

Questions & Answers: Noctua NF-A14 iPPC-2000 IP67 Case Fan

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Noctua NF-A14 iPPC-2000 IP67 PWM, Heavy Duty Cooling Fan, 4-Pin, 2000 RPM (140mm, Black)

Heavy duty cooling fan, 140x140x25 mm, 12V, 4-pin PWM, IP67 certified, max. 2000 RPM, max. 31.5 dB(A), >150,000 h MTTF
Award-winning 140x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior cooling efficiency
12V 2000rpm model (31.5 dB(A)) with 4-pin PWM connector for automatic speed control via 4-pin PWM fan headers, broad 500-2000rpm speed range
High-speed industrialPPC version for industrial heavy-duty applications that require extreme cooling performance and advanced ingress protection
Ruggedised fibre-glass reinforced polyamide construction and IP67 certified water and dust protection

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