Reddit reviews Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x20mm, Brown)
We found 1 Reddit comments about Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x20mm, Brown). Here are the top ones, ranked by their Reddit score.
Premium quiet fan, 40x40x20 mm, 5V, 3-pin Molex, 5000 RPM, 14.9 dB(A), >150,000 h MTTFAward-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance40x20mm size ideal for 1U applications or replacing fans in network and storage equipment (routers, switches, NAS etc.) or other devices such as DVRs5V 3-pin version (5000rpm) for 5V-based industrial applications or replacing 5V fans in various devicesIncludes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connecting the fan to proprietary fan headers
Thermal resistance and heat creep seems to vary. I recently told a user about my experience with heat creep on all metal clone using the Noctua NF-A4x20 5V . Creep set in at about 30 minutes and took 2-3 weeks before I caught it. I used a gun and thermistor to spot it. It was just barely under the threshold to prevent it. I didn't see a noctua in that size range with higher CFM so I bailed on it and went with https://www.amazon.com/gp/product/B006ODM76C/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
This fan has higher CFM. I had to deal with some heat block cooling and autotuning because the excess air flow was cooling the block down. But in the end it worked out and I have not worked on that hotend in months. My experience was with high temp filaments at 250c.
This problem also exist with the regular E3D's which also seems to vary for whatever reasons. A lot of people just go ahead and drop a larger fan. Since we don't really have a in depth inspection of clones to asses which will do it, you are likely going to need a larger fan.