This is an Expression of Interest for HEPA filter efficiency testing services at the Idaho National Laboratory's Research and Education Campus, Advanced Test Reactor Complex, and Central Facilities Area. The selected vendor will perform in-person visual inspections and efficiency testing, maintain records, and coordinate with facility representatives. The purpose is to identify qualified vendors to inform a future formal solicitation. The deadline for submission is November 12th, 2025. Responses must be no more than five pages in PDF format and sent to a specified email address.