Click here for fan comparison guide CLICK HERE FOR RADON TEST KITS Fantech Radon Mitigation Fan - 4" Duct (HP 2133) 134 CFM at 0"WC Static Pressure / 68 CFM at .5" WC Static Pressure Fantech Radon Mitigation Fan - (HP 2133) For applications where lower pressure and flow are needed. Record low power consumption of 14-20 watts! Often used where there is good sub slab communication and lower Radon levels. Choice of model is dependent on building characteristics and should be