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Read our privacy policyVENTS-US VKMS-AntiRADON 305 12" Radon Mitigation Fan is designed for residential and commercial ventilation applications. The fan’s housing is made of steel with a polymer coating. The quiet and efficient backward-curved impeller is capable of operating in high-pressure systems. In-line configuration simplifies installation. All VKM models are designed for standard diameter round ducing. VENTS-US VKM inline duct fans can eliminate many ventilation problems. They are designed to boost airflow through long or complex duct runs and provide ideal solutions for residential and commercial applications. VENTS-US VKM sizes range from 4’’ to 12’’ with airflows ranging up to 985 CFM.