... size selection activated carbon filter sponge are a good air purification filter material formed by carrying high-quality ... : the temperature range: -20°C~130°C.4. Force resistance: gas linear velocity 1.0m/s, pressure drop 42Pa ... length)Product usage: air cleaner, household air-conditioner, central air-conditioning, air freshening machine, smoke exhauster, fan heater, air-conditioning fan, smoking ...