Galvanized steel ductwork can be a system of steel ducts which is protected by a coating of iron with zinc. HVAC technician certification will definitely help in career advancement on this field, for which demand continues to become steady as there's always a necessity for heating and air conditioning. Credit: Creativity103One of the biggest benefits of this type of system is that it operates according for the outside environment. The second job is to clean the environment by removing dust and airborne particles which improves the indoor air quality. There are lots of components that go into an air conditioning system.