I just came down from the attic of my house after having had to replace the attic vent fan.
This was a brand-new fan in fall of '09 when I did a complete roof job. I removed what may have been the original fan from when the house was built in 1965. I only replaced that fan because it "looked old" and had remnants of 4 past reshingle jobs, bit corners of 4 different colors of shingles on it.
I went to Menards (Lowes carried the exact same brand fan) I remember complaining to the company back then as the box stated in HUGE letters on the front face, "MADE IN USA"... just to pull the unit out of the box and see a Made in China sticker on the motor.... false advertising.
The company told me that there was "enough" content in the fan to make the "USA" claim. the company is based in Texas. but since Menards' only competition within 30 miles was 1/2 mile away and they carried exactly the same fan there was no point in returning that one to go buy the same thing elsewhere.
so basically "stuck" with this unit. They sell 3 different sized models, I bought the largest; claims to be suitable for 2100 SF under roof, I have 1850... the middle size one was 1800 SF as I remember. I figured it would not have to work as hard so should last longer.... that idea blew up on me.
Also this unit had a twin control, both a thermometer and a humidistat so dual control over when it would run, the smaller ones didnt have.
About 3 years ago it died the 1st time. I bought a whole new fan unit and since I didnt feel like pulling up my metal roof to replace the whole housing, I just used the motor and control from it and scrapped the new housing.
This time I saw that they now sell "just the motor" for about 1/2 the price of the whole thing. so that was the route I took this time.
Problem being is that although it says "universal" fits all of this company's units, the replacement motor is visibly smaller and is rated at 3.4 instead of 4.3 amps so I don't expect this one to even last the 3 years that each of the 1st 2 have....
The He11 of it all is that the old one was still working when removed, I just replaced it as a preventative measure "while I was in there" and lasted 40-some years to that point and now I am on my 3rd replacement of it in just over 6 years.... not the kind of "job security" I want.. I dont get paid to make repairs to my own house. This company did have a "lifetime" warranty" but to use it I have to hire an electrician for what ~300? to replace a $60 fan.... and they won't pay the electrician's portion of the replacement bill... so that renders the warranty useless.