Oregon & Idaho ASHI Certified Commercial Real Estate Building Inspections & Testing. Certified Inspector For Commercial Buildings & Residential Home Inspections. Commercial Building Inspections comply with the scope of work specified in ASHI, ASTM E2018 . HVAC Air Balancing “TAB”,Indoor Air Quality Testing, Radon Testing, CO / CO2, Formaldehyde, Combustion Testing. BPI, ITC, PTCS, IECC Certifications.