If you have inspected your Coleman/RVP/Airxcel MACH 8 3 blade "quiet" fans and found them to have stress cracks developing please report your findings on this thread. Post photos if you can. Also post the part number of your fan which will be 1472x504 where "x" will be either an A, B or C.
See this thread
and post #24
for photos of where to look for the cracks.
It seems that only two of us so far (Loisjop
and me) have actually reported the problem to RVP. But I also know that Kzemper
had a catastrophic failure and I'm strongly suspecting there are others that have had the problem or are about to.
RVP has been very
responsive and helpful and has a improved fan design in the works, however, understandably there is some doubt on their part as to the extent of the issue. If everyone with the problem reports it here we can all better grasp the scope. I will make sure the RVP design folks have a link to the thread.
If you want to report the issue to RVP directly as well, call customer service (316-832-4357) and ask for Eric Botts (service) or Phil Robinson (design engineering).
If your fans have well developed cracks you can probably see them without removing the AC unit shroud (and should probably stop using that unit until you get a replacement), but to check for cracks in the early stages you will need to remove the shroud and fan blade (photos here
). You will need a Torx T-25 screwdriver bit. The cracks will appear where the blade edges meet the bottom of the hub. Small cracks will eventually become large cracks and the blades will come off.
If you have failed fans or large cracks (imminent failure), and can't wait for the new design (1-2 months) you can call RVP, explain that you have the cracks and ask for a replacement of the current part (1472C504) for the interim. Note that the "C" part does not require the extra washer that some of us needed with our fans to keep them tight on the motor shaft.