Note:Please examine the scale earlier than purchasingsize:AC4158 Activated Carbon HEPA Filter:288*313*36mmAC4155 Air humidifier filter(Blue products):230*149*30mm (Manual measurement can have an error of 1-2 mm)TIP :If you've any questions , please contact me ,or depart a message to us ,we will do our best that may make it easier to ,thanks Compatible with: for Philips AC4080 AC4081 humidifier filters Packing : 1PC Activated Carbon HEPA Filter 1PChumidifier filters