TEC - Fog Puffer Kit SMPU-KIT-001Sealing the slab generally can't stop radon from entering a building on its own, but sealing even small leaks is an important part of building radon mitigation systems that are super effective and efficient using fans with the minimum power consumption possible. TEC has developed a "prototype" smoke pencil based on an e cigarette and a turkey baster. We've been using them for a while now, and we can report that they are the closest thing we have found