Humidifier Model: 400, 400A, 400M & Perfect Diamention: 10 inch H x 13 inch L x 1.75 inch W 45 Humidifier Water Panel (also known as humidifier filter, water pad, evaporator pad) is made of high-quality materials, and it only takesfive minutes to replace it, which saves you a lot of time and money compared to buying a new humidifier. Humidifier water panels (sometimes referred to as a filter) are a regular replacement item in whole-house humidifiers. For the best performance we recommend that the Water Panel be replaced once a year, either prior to the start or at of the heating season. If you have especially hard water - the panel can be replaced 2 times per year. You will get 2 humidifier filters.This complete value pack provides enough clean filters to improve the air in your home.Makes you feel more comfortable while also protecting the items in your home that are susceptible to damage from changes in humidity or dry conditions. Material: aluminum + paper colour: as shown Package Contents: 2 x humidifier filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Humidifier Model: 400, 400A, 400M & Perfect Diamention: 10 inch H x 13 inch L x 1.75 inch W 45 Humidifier Water Panel (also known as humidifier filter, water pad, evaporator pad) is made of high-quality materials, and it only takesfive minutes to replace it, which saves you a lot of time and money compared to buying a new humidifier. You will get 2 humidifier filters.This complete value pack provides enough clean filters to improve the air in your home.Makes you feel more comfortable while also protecting the items in your home that are susceptible to damage from changes in humidity or dry conditions. Humidifier water panels (sometimes referred to as a filter) are a regular replacement item in whole-house humidifiers. For the best performance we recommend that the Water Panel be replaced once a year, either prior to the start or at of the heating season. If you have especially hard water - the panel can be replaced 2 times per year.