This is an Expression of Interest for replacing two Air Handling Units (AHUs 211 and 212) at the TAN-679 facility at the Idaho National Laboratory. The work involves removal, installation, integration, and commissioning, and must comply with specific DOE and safety standards. The Davis-Bacon Act applies to this construction work at the INL site, which is within an 890-square mile boundary in Idaho. The budget is not specified. Responses will be used to develop a formal solicitation list for a potential future Request for Proposal.