1、High Efficiency Filter: The high efficiency filter effectively reduces odors and removes common contaminants, pet dander, hair, dust, and large objects such as some pollen. 2、Replace Filter: Please replace the filter once a quarter to keep the machine clean. High efficiency cotton filter to ensure the normal operation of the machine filtration system. 3、Applicable Models: With wide range of application, front filter element fit for DC19 DC20 DC21 DC29 and back filter screen fit for DC08, 05, 0 4、Manufacturing Material: Made of high quality silicone and high efficiency particulate air materials, feel comfortable, lightweight, portable and anti slip. 5、Simple Operation: Simple to operate, easy to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time.