Aprilaire Evaporative Humidifier, Whole House, 18 Gallons Per Day, Water Panel Evaporator, Fan-forced Evaporation

I’ve been using the Aprilaire 35 Water Panel Humidifier Filters for years now, and they’ve never let me down. These filters are an exact fit for my Aprilaire 600 model, and the installation process is straightforward, no tools required. The filters are well-made, and you can tell they’re built to last. One thing I’ve learned over the years is to replace them at the start of each winter season. If you live in a cold, dry climate like I do, this will make a noticeable difference in keeping your home comfortable. The air feels fresher, and it really helps with dry skin and static electricity. The 2 pack is a nice bonus because it saves me from running out mid-season, and it’s cost-effective. I also appreciate that these are genuine Aprilaire parts, made in the USA. My tip? Mark your calendar as a reminder to replace it every year. It’s one of those small maintenance tasks that can really pay off when it comes to indoor air quality.

This fits more than AprilAire humidifiers. I've been using this water panel for several years on my Trane. They are all basically the same humidifier. If the measurements are good it'll work and they work well. They have a reasonable cost comparatively and come in a 2 pack.

I buy these panels from Amazon every heating season as a replacement for my Aprilaire 600M humidifier. They are exact OEM fit but this year (2024) I've faced some issues with the first box having one out of two panels smashed due to the rough handling in shipping and the replacement box coming with the panels that just didn't look right. Not sure what the color lines on the top of the panel mean, but the right color for my unit is orange I believe. The panels I received as a replacement were of the correct height and width but were noticeably thinner than the original panels I've got with the unit and the ones I received as a replacement last year. Based on my experience orange markings are on the panels with the correct thickness. Red markings are on the slightly thinner panels and the green ones I received as replacements were noticeably thinner than the ones with orange markings. Not sure what those markings mean but based on my limited experience it looks like they are coming in different thicknesses from the factory and marked accordingly. Or maybe produced by different vendors or on different production lines. In any case, orange are excellent fit, red is OK and green looks like production second to me.

All good, genuine

Perfect fit and function.