Aprilaire 4788 - Annual Maintenance Kit for Aprilaire 400 Humidifiers

The Aprilaire 4788 Maintenance Kit is designed specifically for your Aprilaire 400, 400A or 400M Humidifier and includes all the supplies you need to maintain your Aprilaire humidifier each year.

Check out this convenient annual humidifier maintenance kit from Aprilaire! Everything you need to maintain your Aprilaire humidifier is included in this OEM Aprilaire Humidifier Maintenance Kit, Aprilaire part number 4788. The Aprilaire 4788 Maintenance Kit is designed specifically for the Aprilaire 400, 400A or 400M Humidifier models.


Purchase this handy Aprilaire 4788 maintenance kit and say goodbye to the hassle of keeping track of when to clean or replace the various components in your Aprilaire humidifier. Simply buy this kit and you can return your Aprilaire humidifier back to factory "new" condition each year!


*Please Note: This maintenance kit is NOT for models: 440, 445, 445A, 448


This Aprilaire #4788 Maintenance Kit includes:


The Aprilaire 400 Series Humidifier Maintenance Kit is assembled of all Genuine OEM Aprilaire parts. Buying these parts as a kit, instead of separately, saves you money and help get all of your maintenance shopping done in one quick stop!


Aprilaire suggests replacing the 4788 Maintenance kit before every humidification season, or every 12 months.


These are genuine OEM Aprilaire replacement parts and made in the USA!


If you have any questions regarding this product, please use the HVAC.com Contractor Directory to connect with a trusted contractor in your area.

Humidifiers and any other equipment or parts requiring electrical or gas connections during installation should only be installed by a licensed contractor. Humidifiers.com does not offer a warranty of any kind. If you choose to perform your own installation you may void any and all warranty coverage from the manufacturer. Please refer to our terms and conditions page for more information about our warranty and return policies at:


Aprilaire Warranty: Your Research Products Corporation Aprilaire® humidifier unit is expressly warranted for five (5) years from date of installation to be free from defects in materials or workmanship except, however, for the disposable Water Panel which will have to be replaced from time to time depending upon the amount of use. Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any part of the humidifier which is found to be defective within such five (5) year period and which is returned not later than thirty (30) days after said five (5) year period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin 53701, together with the model number and installation date of the humidifier. THISWARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE HUMIDIFIER ITSELF. IMPLIEDWARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID FIVE YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS UNIT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION. Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above exclusion or limitations may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

Aprilaire 4788 - Annual Maintenance Kit for Aprilaire 400 Humidifiers