The product is a test book titled "Gas Heating: Furnaces, Boilers, Controls, Components" written by Jason Obrzut CMHE. Published in 2019, this book focuses on the technology and engineering aspect of HVAC systems, specifically covering topics related to gas heating such as furnaces, boilers, and controls. The content is presented in English and serves as a valuable resource for those looking to study or prepare for exams in the HVAC field.
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