AprilAire H635EZ1 Humidifier Filter/Water Panel Assembly Replacement Kit for AprilAire Whole-House Humidifier Models: 600, 600A, and 600M

Fit like a glove. Easy to install and works great.

Easy to install in minutes. Take out the old, put in the new , and the humidifier is like new. Filter is snug. No more “Magivering” to keep it in its place.

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

Perfect fit for my model 600. OEM part. Took a long time to ship.

Perfect replacement for my old humidifier filter! It was really easy to take out the old filter and holder, and replace it with this one. I was a little worried not knowing anything about the HVAC system, but it was super easy and just needed to be placed into the holder attached to my system and close the door. I was thrilled, it took no time at all and it fits awesome. There has been no leaking and it has been filtering the humidity, especially now that it is summer. The plastic black holder around the filter is strong and relatively thick.

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.

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