[SIZE]Air Purifiers alternative filter element(2 x 2 x three inch). [FILTER COMPOSITION]pre-filter layer, HEPA clear out layer and activated carbon filter layer. [FUNCTION]This filter out supports to purify pollen, smoke, domestic dog dander and PM2 Micrometre pollution within the air. [REPLACEMENT CYCLE]It is suggested to switch the air purifier clear out facets each 3-6 months. The provider life of the clear out will depend on the working time and current air conditions. colour:White Material:plastic Package Contents: 1 x Air Purifiers Filter Only the above equipment content, varied merchandise are usually not included. Note: Light taking pictures and sundry exhibits could cause the colour of the item in the photo just a little various from the real thing. The measurement allowed error is +/- 1-3cm.