The 3404 is the correct replacement for these models:
The Toastmaster Humidifier Filter Replacement is for your Toastmaster 3404, 3408, 3412, 3412, and 3416 models. The Toastmaster humidifier filter may also be referred to as the T57. This Toastmaster Table Top Humidifier filter replacement helps prevent the build up of impurities in your Toastmaster humidifier. The filter should be replaced every 30 to 45 days, or depending on usage.
2-Pack Toastmaster Humidifier Filter Specifications:
This Toastmaster Humidifier Replacement filter is a wick filter that has a reinforced design to ensure your filter has both a longer life and more efficient usage. The anti-microbial treatment on the Toastmaster 3404 Filter replacement will prevent algae, fungus and bacteria from growing on your filter or in your humidifier.