42 Testing, analysis, inspection, and evaluation of heating and air conditioning systems, HVAC systems, ventilation systems, air filters, air ducts, ductwork, and industrial coils to assure compliance with industry standards; testing, analysis, inspection, and evaluation of air flow and air quality to assure compliance with industry standards; consulting services to assure compliance with industry standards in the fields of testing, analysis, inspection, and evaluation of heating and air conditioning systems, HVAC systems, ventilation systems, air filters, air ducts, ductwork, industrial coils, air flow and air quality; testing, analysis, inspection, and evaluation of fire dampers to assure compliance with industry standards; consulting services to assure compliance with industry standards in the fields of testing, analysis, inspection, evaluation, and certification standards of fire dampers