The Trion 4008 is the correct replacement filter for the following humidifier models:
The Trion 4008 Humidifier Filter Pad Replacement is a replacement filter pad for the Herrmidifier Model 4000 and 4000C Humidifiers. This Trion humidifier filter measures approximately 15.5 inches x 11.25 inches x 1.25 inches. This Trion humidifier pad effectively reduces mineral pollutants within your humidifier tank in order to provide clean humidification in your home. This filter replacement is a genuine Trion humidifier part.
Trion 4008 Humidifier Filter Pad Replacement specifications: