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Good information Jim, thanks for the research.Does anybody know if the OE fans on the GTX3 are as loud as the OE fans on the GTX2?Bob
Bob,Based on the environmental data in the user manuals, the GTX3 produces about the same noise at one meter as the previous models, between 40 and 45 db. In my case, the original fans were much too loud to have in my listening room, but are not noticable from listening spot now that I replaced with quiet fans.
Jim,I replaced fans on a GXT 1500 ERT (extended run time) that I found locally with almost new batteries, and did not have any problem with an alarm after the swap. Bob,Mine sure seemed louder than 45 db as well, so perhaps they get louder with age. I can not hear the new fans, which are rated at 16db I think, from my listening area, but can still hear them if I get within a few feet of the UPS. In any case, Liebert's tests are done in a controlled test with new units, so it does allow you to compare between the different models.
I "think" the only problem Liebert is the GXT3. The GXT and the GXT2 seem to take to the fan replacement fine.-Jim
I know this is tread is very old but it is the top result in google for fan swapping for a gxt3. I added two 20 ohm 10w resistors in series across the rear fan connection along with changing both fans for some Arctic P8 and everything works fine and is MUCH quieter now. Im sure just one 40 ohm resistor would work so long as its rated for at lest 5w will work but 20 ohm ones on amazon are cheap and just helps spread the heat. I epoxied both of them to a magnet and stuck it right in front of the rear fan. That way it has air flow and heat can sink though the magnet and into the case. One thing to note is the usp only monitors the rear fan it seems so you only need to add resistors to that one.
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