42 Validating services, namely, testing, inspection, evaluation, and verification services of buildings, prefabricated buildings, and laboratory buildings; validating services, namely, testing, inspection, evaluation, and verification services of clean rooms for the manipulation and handling of pharmaceuticals, chemicals, and hazardous materials; validating services, namely, testing, inspection, evaluation, and verification services of down flow booths for laboratory use; validating services, namely, testing, inspection, evaluation, and verification services of laminar flow booths for laboratory use; validating services, namely, testing, inspection, evaluation, and verification services of glove boxes in the nature of rigid enclosures incorporating gloves for protection against chemicals, radiation, accident, or injury while handling hazardous materials; validating services, namely, testing, inspection, evaluation, and verification services of laboratory isolators in the nature of rigid enclosures incorporating gloves for protection against chemicals, radiation, accident, or injury while handling hazardous materials; validating services, namely, testing, inspection, evaluation, and verification services of air filtering installations in the nature of down flow booths for industrial use; validating services, namely, testing, inspection, evaluation, and verification services of air filtering installations in the nature of laminar flow booths for industrial use