1) Features: high temperature, long-term use the URL above 250 ℃ under and above 350 ℃ environment: http: //www.3uu2.com/ 2) Usage: clean oven and other requirements for equipment and high-temperature air purification systems use the URL: http: //www.szxeyjj.com/ 3) Type: high temperature filter box 4) Final resistance :( recommendation) ≤600Pa 5) Temperature: ≤350 ℃ 6) Humidity: ≤100% RH