A factory HVAC plan can be designed to understand the importance of it. Heating, Ventilation, and Air Conditioning (HVAC) plans are used to make and maintain systems of heating and air conditioning. As shown, HVAC plans are an important part of factory planning as it shows how water networks, boiler, and air ducts are installed in the building to make sure that the proper planning is done in the building. As per the image, a factory HVAC plan has three core facts: installation qualification (IQ), operational qualification (OQ), and performance qualification (PQ). While creating the HVAC plan for a factory, the HVAC system is an essential subject to provide documented evidence about its accuracy.