The Assistant Heating & Ventilating Engineer Passbook® prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: Principles and practices of mechanical engineering, including energy conservation; Interpretation of codes and standards applicable to mechanical systems; Design and construction of heating and ventilating, refrigeration and air-conditioning systems; Construction, installation and operation of piping systems, including test methods; Contracts, drawings, specifications, engineering, calculations and estimates; Preparing written material; and more.