Compatibility Fits the following models: A939KBGS, A937KGMS, A907GMS, A927KGMS, A925KSM, A927KVMS, A905RM, A908VMR, A929KVM, A913BM, A958SG, A9ULTIMATE, A9SINGLE, A9MULTI, A9PETNBED2X, A9MASTER2X, A9PETNBED, A9ESSENTIAL, A9MULTI2X, A9ADVANCED, A902RM, A906SM, A958KA, A958SA, A9DDCARPET2, and A9DDCARPET. Durable construction The replacement filter is made from high-quality ABS plastic and a specialized non-woven fabric filter. This combination delivers reliable breathability, moisture resistance, and flexibility to fit and function over time. Dust-free seal A rubber ring on the filter tightly adheres to the plastic frame to create a sealed unit while preserving proper airflow. This design helps prevent dust from leaking into the vacuum motor. Replacement interval Replace the filter approximately every three months for optimal performance, or sooner if heavy soiling occurs. For less polluted environments, replacement every six months is recommended. Use scenarios - Homes with pets: reduces pet dander and hair buildup while maintaining suction and motor protection. - Carpeted living spaces: supports consistent airflow and filtration during frequent vacuuming. - Environments with dust exposure: helps manage fine dust and debris to protect the vacuum motor and extend filter life.