Note:Please check the dimensions earlier than purchasingsize:AC4158 Activated Carbon HEPA Filter:288*313*36mmAC4155 Air humidifier filter(Blue products):230*149*30mm (Manual size could have an error of 1-2 mm)TIP :If you've any questions , please contact me ,or go away a message to us ,we will do our greatest to help you ,thanks Compatible with: for Philips AC4080 AC4081 humidifier filters Packing : 1PC Activated Carbon HEPA Filter 1PChumidifier filters