Principles of roof design and drainage systems. Calculation of downspout and gutter ... 1 Period Principles and design of duct systems, construction layout, standards, and ... and operating principles of control systems, thermostats, and heat pumps. ... 1 Credit 1 Period Refrigeration cycle, system components, types and functions of ... Ventilation and Air Conditioning (HVAC) systems, and material takeoffs on plumbing ... for indirect and special waste systems, receptors and backflow preventers, ... combination waste and vent systems, and sumps. Prerequisites: None. IMC134 ... . Installation procedures for bathtubs, showers sink and lavatories and water closets, ... handicapped requirements. Recirculation systems and installation, adjustment and ... , operation and control of distribution systems to maintain air balance. Air balancing ...