The Fantech Rn3 is an excellent choice for elevated radon levels, poor communication, multiple suction points, and/or large sub slabs. The Rn3 replaces Fantech model HP220. Kit includes Rn3 radon fan, 2 4x6 couplings, manometer and system labels. Choose white or black couplings. White couplings are preferred for outdoor installations as they are UV resistant.