Air Systems Cleaning Specialist (ASCS) Practice Exam

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Transite (asbestos) pipe is commonly found in which type of HVAC systems?

Dual duct system
Sub-slab system
Constant volume system
Variable air system

The correct answer is: Constant volume system

Transite pipe, which contains asbestos, is commonly found in constant volume HVAC systems. This is primarily due to the historical use of asbestos in construction materials, especially prior to the awareness of its health risks. Constant volume systems operate by delivering a fixed amount of air to a space, maintaining constant airflow regardless of the demand for heating or cooling. These systems were typically designed and installed when asbestos materials were widely used, as they provided effective insulation and durability. The presence of transite pipe in this scenario can often be linked to older buildings where these systems were installed. Other types of systems such as dual duct systems, sub-slab systems, and variable air systems, might not have the same historical reliance on asbestos-containing materials, making constant volume systems the most associated with transite pipes. Understanding the context of when and where these materials were used helps underscore why constant volume systems are the correct answer.