Extend your air purifier warranty one year when you use a Filter-Monster branded replacement filter. Read more in Extended Guarantee Tab below. Replaces Therapure TPP240F Recommended to replace every six (6) months, or more often in harsh environments, for maximum efficiency Approximate Dimensions: 23 x 4 x 2 inches Filter-Monster branded replacement filter compatible with Therapure TPP240F removes smoke, dust, pollen, pet hair and dander, mold spores and dust mites from the air.