Bests & Worsts Reviews from Amazon

[Edit: June 2018] It died after 3 years of 3-months of summer use. Expiring after 9 months is not good... <Air flow> <In> Standing on the doorway, 12 feet away from the window (slightly oblique), I could feel the breeze from head to toe. I would guess that's as good as 20" box fan on low. <Out> After dinner, the smell of food often lingers in the second floor hallway. In about 20 minutes of fans blowing air out the second floor window, I could smell nothing. These little 5 inch fans moved air 50 feet from kitchen door through one of the rooms upstairs. *I tried to work the fan with the wind both in and out. Not against the wind. I opened windows in other rooms too. <Noise> You can immediately tell that the fan is on as soon as you enter the room, but it's not like big blades making wind-chopping noises like box fan or range hood fan. It's smoother kind of fan noise. If I turn on only 1 fan, I can hardly tell if anything is on. <Minor annoyances> 1) One fan is very smooth, but one other fan is making small vibration. 2) Fans are uni-directional, so I have to turn the fans around if wind direction changes. 3) Stinky black rubber on either end leaves small black stains (but rubs off). 4) I wish fan speed could be controlled instead of turning on one by one. <Problem> 1) Without lubrication, fans will seize. 2) Switch has voltage spike or something. I had it plugged on the same surge protector as my computer. Every time I turn on or off the switch, "Pop!" from my speaker. Maybe because the plug has only 2 prongs instead of 3? <Verdict> It works for me. It's shallow enough that I can leave the bug screen. It can suck out fajita smell all the way from downstairs kitchen in about 20 minutes. Neither ceiling fan nor AC can do that. From 2 feet away from my head, it's somewhat noisy. But thanks to 9 blade fans, it's more of a white noise than chopping propeller noise of box fans. Despite dangerous sounding popping speaker noise with the switch, I might buy another; one room in the south can blow in, while the room in the north can blow air out. <Update: July 2016> These fans need a few drops of oil every few months (motor oil will do the trick). These fans have a steel axle resting on copper bushings. NO BEARINGS. IF YOU DON'T LUBRICATE THE AXLES, THEY WILL SEIZE ON YOU. It's not hard to do. But you must unscrew 20 screws and screw them back on. There is an axle clamp on the fan, but it's not hard to take it out. I found that the motors get quite hot too. Under each fan, there is a plastic cover that's almost completely encasing the motor. Since my fans won't get a lot of dust or rain, I took those motor covers off. The center part of the fan is already a cup-shape, so I don't know why motors are doubly covered. No cover should keep the motors run cooler, and burn off less lubricants. I've used one drop of clean motor oil on the front and back side of the axle on all 3 motors (total of 6 drops) and that seems to work. Don't buy this fan if you are not willing to take it apart and lubricate it. If you don't lube the axles, don't be surprised if they die on you after a year. [Edit June 2018] It died after 36 months... I oiled them, and I replaced the fuse. No use.