I give it a 4&1/2 star. I would have given this a 5-star rating if it came with nuts that hold the bracket in place. The old nuts didn't fit. They were a bit loose, so I had to apply some tape to make 'em fit.I ordered this to replace a NuTone wall unit that looks to be at least 40 years old. On the inside it has the square cover with metal filter that almost looks like a stove top burner. Removal of the old motor was as simple as removing the center screw to remove the cover/filter, the unplugging the motor, then loosening two bracket screws, then twisting and removing the motor and bracket. Two more nuts and the bracket comes off, leaving the motor. The fan pulled off.The original motor had a 1/4" shaft, which seems to be an odd duck. The motor was somewhat heavier and thicker than this replacement, and the shaft was a bit longer, so I had some reservations about whether it would do the job.The mounting fit was an exact match, which was expected given that the mounting holes all appear to be the same on all units sold of this type.In order to get the old fan to work (the squirrel cage type fan that comes with this unit is no good for horizontal, through the wall applications), I had to wrap the new shaft in electrical tape about 2 or 3 times around. With the tape applied, the fan was a firm push fit onto the shaft. The plane of the fan blade is not perfectly perpendicular to the axis of the motor shaft, but good enough for a bathroom that might only be used once a day.The plug fit into my housing outlet with no issues (the outlet is polarized, so there was not issue with that). At first, the fan was spinning rather slowly and did not seem to be generating much air movement. The outside housing has a single flap that hangs down about 30 degrees off vertical and is held in the closed position by a long, thin spring. With the fan running, the flap is pushed toward the straight down position and a gap opens up. At first, the gap was small and not much air was moving. I thought that this motor would not work.After a couple of minutes of running, however, the fan picked up speed substantially, and then stayed that way. At that point, the flap was opening 1/2" to 1.4" and a good amount of air was moving. For my bathroom (about 3' by 8' with no shower), this fan should be plenty strong enough. I would not necessarily think it would work for a substantially bigger application.For the price of this item, delivery included, it was worth taking a shot. I was unable to find an exact match - the few that had 1/4" shafts had much longer or much shorter shafts, and the ones that were close were all looking to be 40 or 50 dollars. Ouch. So I thought for my application - a small space with no shower, I'd give this inexpensive motor a shot.I will update this post if any issues occur.It fits, with a little work, and it works as it should. I can't quite give it 5 stars, as one prong on the electrical plug had to be filed down, to save me from having to change the 1970's plug socket, which looked like a lot of trouble. I am sure they are not allowed to sell any product without the new oriented plugs, so this is not any fault of the manufacturer. Also the fan blade shaft was made too long, and I had to cut it down by about a centimeter. Luckily I had a hacksaw and a vice and the shaft was grooved at exactly the right place, so this was easy. (As a tip, make sure you round and smooth the newly cut end of your shaft, or you may have trouble pushing the blunt sharp edged end into the plastic blade wheel). I was relieved to find that The two little bolts that attach the mounting bracket were exactly the correct distance apart,. However, the back of the longer bolt jutting away from the bracket was in a new, odd place without support, so I was at first worried. However, I realized that the long bolt is only to hold the decorative vent cover tight against the ceiling, so it only needed enough support to get a decorative central thumb screw started, and a piece of scotch tape held it long enough to get the thumb screw in place for the final assembly, though it was BARELY long enough.I at first thought my new fan seemed louder than the original, but comparing the noise level with my other bathroom fan, which is original to the house, it is actually the same. I just never noticed the level of noise before. Even though the new fan is, for some reason, held not quite in the center, it still seems to suck air out of the bathroom, though perhaps not quite as aggressively as the fan in the other bathroom, with the original motor, testing the suction with little strips of toilet paper, Perhaps i did not get the shaft length quite right, or perhaps I warped the blade disk while trying to push the shaft into the center, making it wobble a little as it spins. (That is why I recommend making the shaft tip nice and smooth). I am very happy to have it fixed, and it cost so little.This product was a near perfect match for a 30 year old bath fan in my home. I could not tell you the name of the bath fan manufacturer; all stickers and marking have long since disappeared. But from the pictures and descriptions it seems that this style of fan was popular from the sixties - nineties. It should fit just about anything.There are a few things that are not stated in the description.- The two prong plug is polarized. This means that one is bigger than the other, many bath fans will not have the two different sizes. The way to fix this is to file or grind down the bigger plug on the fan. Check your current fan first if you don't want to do that kind of work.- This motor runs Counter Clockwise (CCW) when viewing the motor from the top, not the bottom which is the way it looks when you look up into the fan. I thought it was a correct motor even after double checking the fan direction, but it turns out I needed CW. You can change the direction fairly easily, but this fan comes with no instructions, so here you go: - Remove the nuts from the bottom of the motor/ unbolt the little green of black bolts from the top of the motor. Once these are removed the whole shaft, with magnet and the two sides just plop right off/ Take the center part that has the electrical connected to it and flip it upside down/ now reassemble the motor/ The motor will look identical to when you took it apart with one exception, the electrical connection will come out of the top of the motor and no longer the bottom.I hope those tips will help those trying to install or decide on making a purchase.