Product review (1 stars): poor quality
the water panel is slightly thinner than previous one.  it came with a coating that is flaking off, leaving a powdery residue (previous one had a coating, but was not flaking off when installed).  Since installing, my whole family is having allergy symptoms.  Either a cheap fake, or Aprilaire quality control is slipping.  I had to turn off the humidifier until I find a better water panel