Collector boxes, also known as a plenum, are a crucial component of a heating, ventilation, and air conditioning system. It is a box or chamber that is connected to the ductwork of the HVAC system, and serves as a central point for the distribution of heated or cooled air throughout a building. For an efficient and reliable HVAC system, the furnace box is a great choice for optimal... https://www.partshnc.com/ventilation-parts/collector-boxes