Product review (5 stars): Perfect Fit.
I realized after having my heating and cooling system for over four years that I needed to replace the water pad in the Aprilaire yearly. The unit did not indicate that the filter might not be working properly but even adjusted at maximum water output my indoor humidity is never higher than 25 to 28 during the winter months. I ordered the two pack of water pads which arrived at lightning speed. These were bonified Aprilaire pads as advertised, not knock offs. The replacement pad was a perfect fit and only took a few minutes to install. After determining my water lines were not clogged and the unit was operating as it should, I was back in business.

Unfortunately my humidity percentage has still not increased. I still need to run an additional humidifier to make my home more comfortable.