Fasco 9721 1/12 HP, 1550 RPM, 1 Speed, 3-3/8-Inch Motor Diameter, Reversible Rotation, 5/16-Inch by 3-1/4-Inch Shaft OEM Direct Replacement

Súper genial funcional muy bien

I recently bought an exaust fan for my roof. Even though it's a new unit, in the future I'll have to replace the motor. I bought the exact same motor on amazon. It can be a real pain finding a motor after it fails. And a lot of local dealers wouldn't have an exact replacement motor. And then they will have it special ordered which is going to add to the cost even more. And I mean the motor is identical from the name, speed, mount, and wiring. And the price couldn't be beat. And I got free shipping. I hate to think how much running around I would have had to do to buy it locally.

Fan worked well, as expected. No problem reversing the fan direction. Fan can be mounted in multiple configurations if needed.

I purchased this to replace a roof vent fan I couldn't find a decent quality replacement motor for(they are all junk far as I can tell) Had to buy the correct size fan for it and make up some brackets to mount this. Very quiet as I installed with grommets to keep vibration down(metal barn roof). Quality unit all around, will buy another to replace other fan motor that is getting noisey.

' I exchanged twice, for a total of three motors received, and all of them shook hard enough to make a heavy workbench buzz when powered for a test run in a no-load condition. I'm not talking vibration, I mean shaking. Hard enough that I was convinced they were doing a very slow self destruct. Electric motors don't work this way, of course. They spin quietly, with a mild vibration caused by rotating parts, cooling air being forced through small openings, and varying magnetic fields. Electric motors hum, but they don't shake. I'm sure you'll doubt that I could receive three bad motors of a standard brand. Especailly considering the good reviews this motor received from others. I find it incredible myself, but I'm just reporting my experience. Probably I should mention that I'm not a handyman, I'm a tech. When you call "the guy," I'm that guy. I know what's going on in there, which makes this whole thing all the more surprising--and disappointing--to me. UPDATE May 4, 2014 I bought the similar Fasco D1127 motor from Amazon. Bought it twice, in fact. The problems (as I see it) of vibration and overheating remain, as follows. Vibration with the Fasco D1127 was less than with this Century/A.O. Smith 9721. Still no better than what I'd call marginally acceptable, but something I thought maybe I could work with by cobbling together a flexible mount. The whole vibration thing continues to mystify me because every other electric motor I've worked with (which is more than several) just spun quietly. Overheating, however, was a different story. Both Fasco D1127s overheated to the point that their internal protectors opened, the same as this Century/A.O. Smith 9721s. But there's more to that story after a sidebar. Sidebar: one of the many ratings for electric motors is insulation class. The motors being discussed here don't state their insulation class, but I observed in all cases that the motors cut out at an external case temperature of approximately 130 degrees Celsius. Class B insulation is rated for 130 degrees Celsius, so take that information for what it's worth. Getting back, by now my frustration level was pretty high (and so was Amazon's, as we'll soon see). Having a Fasco D1127 in hand, I performed a very close examination with a work light and mirror. The surprising (to me) bottom line is that as far as I could see the Fasco D1127 has no internal cooling fan. Usually looking inside a motor you see vanes that act as a centrifugal fan, forcing cooling air though the motor. But on the Fasco D1127 I could see none. I can't guarantee there are none there because I was peering though the ventilation openings and didn't have a really great view of things inside, but I certainly couldn't see any. In a way this stands to reason, and is acceptable. These motors are intended for use in fans, so it might be reasonable to expect that they'll be mounted in a cooling airstream. My pre-use tests were were made on the bench in open air, so no airstream, so no cooling. Remember that the only motor I examined this way was a Fasco D1127. I speculate (but do not know) that this Century/A.O. Smith 9721 motor has the same setup, which would explain the overheating in all cases. If the setup is the same, this would also explain the 5-star ratings for this Century/A.O. Smith 9721 motor, in opposition to my "unacceptable" rating. Still speculating, others did mount the motor they received in moving air, so they had no overheating--although the vibration I observed remains unexplained. I think it's worth adding that the specs listed when I was buying these motors did not state "must be mounted in an airstream," or "must be mounted air-over," or similar, which pretty much leaves the whole thing up to chance. So to state something of a bottom line, as far as I can tell these motors must be mounted in moving air, which of course is not a problem if they're running a fan blade or blower and are in their own airstream. However, they still have what I view as an unreasonable level of vibration. To bring this tale to a close, I had now ordered and returned a total of five motors, which apparently lit up a light somewhere. Amazon sent me a polite note of thanks-anyway, and returned my money. I can't really blame them, by now the shipping department was probably complaining about the extra work. They did stand behind their warranty 100%. However, I'm not doing all this for fun, I still need a motor. Updates will occur. .

Excelente

These motors are the ones to buy for chiller evap use. They have it all. They are energy efficient, work at 120/240, go in either direction, and have bearings good to 40 below. They cover most HP requirements. One motor does it all.

These motors are exactly what we were looking for.

Motor current = 0.9 amps was missing on the description. However I was able to zoom in on the nameplate where I found this info. All other information on the description was accurate including the reversion option which is as easy as it can be. Very happy with it.