DC 250 CFM Flangemount 4" BlowersFeatures:Tough Reinforced Plastic HousingMount to any Flat surfaceSlip-On Inlet Ducting ConnectionEfficient High Volume Air FlowLow Current DrawCorrosion-Resistant Materials ThroughoutN.M.M.A. Type AcceptedMeets USCG Regulation 183.410 and ISO 8846 MARINE for Ignition ProtectionComplies with Complies with ISO 9097 MARINE WARNING: This product can expose you to chemicals including NICKEL (METALLIC) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.