Permatron takes pride in the quality and workmanship of our products. All air filters are built to give years of trouble-free service. Any filter found to be defective in workmanship or materials, when returned to Permatron shipping charges prepaid, will be repaired or replaced without charge.Our Permatron product warranty period begins from the date of purchase and does not cover damage caused by excessive heat, disassemble, rough handling or improper installation.DO NOT take the unit apart for cleaning, as this is unnecessary. With proper care and regular cleaning, your Permatron filter should last many years. Permatron Corporation makes no medical or health claims other than that the filter will effectively remove particles from the air.