42 Engineering services, namely, commissioning building systems in the nature of evaluating, testing, and inspecting HVAC and water systems; Engineering services, namely, commissioning building systems in the nature of reviewing designs of HVAC and water systems to develop verification and validation test plans and making appropriate measurements to implement those plans; clean room performance testing services, namely, measurement and verification of air quality for cleanrooms; balancing HVAC systems, namely, measurement and verification of air flows and relative pressures between rooms for the purpose of controlling air quality; testing HVAC and water systems to ensure proper functioning; testing HVAC systems, namely, inspection of fire and smoke dampers to ensure proper operation; building envelope testing services, namely, testing building pressures and air leakage to assure compliance with HVAC industry standards; building envelope testing services, namely, measuring building leakages and pressures; site sustaining services, namely, inspection, testing and monitoring HVAC systems and fire and smoke dampers to ensure proper functioning; cleanroom performance testing services; fume hood testing services, namely, evaluating performance efficacy and assuring compliance with HVAC industry standards; thermographic testing services, namely, thermographic testing to evaluate thermal defects and air leakage in buildings