Heatresistant composite sponge construction for durable performance and formaldehyde removal, helping improve indoor air quality in hot conditions. Compatible with a wide range of air conditioning models; ideal for bedrooms, living rooms, or workplaces to maintain fresh air. Longer maintenance cycle: 6month replacement interval with optimized airflow to boost cooling efficiency and reduce upkeep efforts. Silver ion technology infused in the filter cotton pads inhibits viruses and provides 98% PM2.5 filtration efficiency for cleaner, healthier indoor air. Materials: heatresistant composite sponge; formaldehyde removal filter pads; silver ioninfused filter cotton pads. Use scenarios: In a hot bedroom during summer, to maintain fresh air and efficient cooling. In a small office or workstation, to reduce pollutants and keep air healthier with less frequent changes. In a living room or common area, to support cleaner air and lower maintenance while the AC operates.