In Section R156-55a-301, in B100 and R100 - this change allows B100 and R100 contractors to install passive radon controls in new construction without immediate supervision by a person who holds a Radon mitigation certificate. However, the installation must still comply with the building codes requirements for passive radon controls. In Section R156-55a-301, in S354 - the change requires radon mitigation work to be performed under immediate supervision of a person who holds a radon mitigation certificate. This is the same supervision that is already required for active radon mitigation work when performed by the B100 and R100 contractors classifications.