Product review (5 stars): Exact replacement that is less expensive than new
My Aprilaire 700 series humidifier had stopped working and the cause was a seized fan motor. This solved the problem in about 15 minutes. Getting the humidifier apart was more difficult than replacing the motor itself. Note that you'll also need to buy the rubber isolation ring also sold on Amazon to replace the cork ring glued to the old motor. Once installed and the humidifier put back together and mounted, it is very quiet and works effectively. While somewhat expensive, replacing this is much cheaper than replacing the entire humidifier if you could find one to exactly fit the air plenum. Item shipped quickly and was well packaged.