air

assembly

building

caucasian

ceiling

checking

circulation

construction

cool

duct

engineering

equipment

exhaust

fastening

flow

hanging

heat

hvac

indoor

industrial

infrastructure

inspecting

installation

installer

male

man

metallic

modern

new

occupation

person

pipe

pipes

scaffold

shaft

silver

system

technician

technology

tube

uniform

vent

ventilate

ventilation

warehouse

wear

work

worker

yellow