Furnaces
Aprilaire Humidifier Replacement Guide
By HVAC.com•August 1, 2023
Do you have an old Aprilaire humidifier that is over warranty and beyond repair? Companies come out with new models and series of products all the time, constantly trying to make their products more user friendly, efficient and effective. However, that becomes troublesome when you look to replace your current humidifier and find that it is no longer manufactured. Below is a guide to show you what new Aprilaire humidifier model replaces your old model.
| New Aprilaire Replacement Models | Old Aprilaire Models |
| 700 Automatic / 700 Manual | 110, 112, 700, 760, & 768 |
| 600 Automatic / 600 Manual | 220, 224, 440, 568, & 560 |
| 500 Automatic | 500 & 550 |
| 400 Automatic | 445 |
Okay, so you see the new model that replaces your old Aprilaire humidifer, but will it fit the hole that is already in your ductwork? Great Question… Below we have the Plenum Opening (or opening in duct work) sizes so you can be sure you are getting the best replacement for your home.
| Aprialire Model Number | Width Measurement | Height Measurement |
| 110 | 135⁄8“ | 11 13⁄16“ |
| 112 | 19 3⁄8“ | 12 15⁄16“ |
| 220 | 10 1⁄8“ | 11″ |
| 224 | 15″ | 12 3⁄8“ |
| 400 Automatic & 400 Manual | 9 3⁄4“ | 12 1⁄2“ |
| 440 | 13 3⁄4“ | 11 1⁄4“ |
| 445 | 13 3⁄4“ | 11 1⁄4“ |
| 550, 500 Automatic, & 500 Manual | 9 3⁄8“ | 9 1⁄2“ |
| 560 | 9 3⁄4“ | 12 1⁄2“ |
| 568 | 9 3⁄4“ | 12 1⁄2“ |
| 600 Automatic & 600 Manual | 9 3⁄4“ | 12 1⁄2“ |
| 700 Automatic & 700 Manual | 14 7⁄8“ | 14 3⁄16“ |
| 760 | 14 7⁄8“ | 14 3⁄16“ |
| 768 | 14 7⁄8“ | 14 3⁄16“ |