AprilAire H635EZ1A Humidifier Filter/Water Panel Assembly Replacement Kit for AprilAire Whole-House Humidifier Models: 600, 600A, and 600M

Easy to setup, Good fit, no leaks, and is very sturdy!

One is really unable to write an really exciting review about humidifier filters, so I won't. I will say buying them was a very pleasant experience, not to mention one can't even find these kits in the big box stores. I worked and worked, but could not get the lime deposits off of my water panel assembly frame (the only real way to do so is to use cleaning vinegar, which is a "no-way" for me, as the smell of vinegar makes me sick. So, this kit was a no-brainer for me - just remove the front humidifier cover (this is on an Aprilaire 600 unit), then remove the thin water delivery hose from the top of the panel cage, remove old cage with old filter, replace with new cage and filter, replace water delivery hose, and replace cover - it's that easy! Aprilaire suggests you turn the unit off before doing this. I usually don't, as the whole process only takes about a minute anyway, but do what you feel comfortable doing. I bought enough to keep stocked for the next 2 winter's use. Good Luck!

The unit is not used as it first appears. I opened mine and sent it back to Amazon because I thought it was used. There was a lot of what looked like calcium deposits. When the second one came and it was like the first, I called AprilAire support in Wisconsin and they were very helpful in explaining to me that it is a factory coating and not a unit that's been previously used. Do not go by the photos of the product that show a clean grill because you will like me think they have sent you a used one and that is not the case. This was my first time ordering a replacement. Now I know. Hopefully this will help you too

For anyone tired of the expensive metal frame filter pads rotting out in their older Carrier humidifier with the built-in guides approximately 14" x 10-3/4" x 2-1/4" (similar to model 49FH024121 with filter 318518-761), this kit will fit with minor modifications. To get mine to fit, I trimmed off the half round tabs on the frame openings flush to the edge lip, cut off the protruding bottom spout flush, clipped off the top of the tube guide, and about 1/2" off the top of each of the internal guides in the humidifier box to allow the distribution part of the frame to sit below the lid. No issues with the fan, bottom and top lids, water valve, and no interference with the fan. It also has the benefit of fitting the opening better so it is likely to perform better with less air going around the pad instead of through it. Good luck and hope this helps someone else.

I have been using AprilAire 600 for several years, and I change the new kit every winter, and this time is no exception. The new kit is perfectly adapted. No tools are required for installation, and it can be installed in a few minutes. The quality of the water panel is as good as ever, and the moisture is evenly distributed. After replacing it, the humidity increases rapidly, and the air at home is fresh and not dry.