
Aprilaire® 4640 Replacement Scale Control Insert, For Use With Model 500 Humidifier, Plastic, Black
DSG#337249
Aprilaire® 4640 Replacement Scale Control Insert, For Use With Model 500 Humidifier, Plastic, Black
DSG#337249
- The Aprilaire Scale Control Insert 4640 is the U-shaped component which encases the Water Panel Evaporator. Used with water panel number 10 and water distribution tray part number 4331. For Models 500, 500A and 500M.