This supply air duct plenum is made of galvanized steel with 26 gauge thickness and measures 23.5 x 19.5 x 36 inches. It is designed to fit seamlessly into HVAC and refrigeration systems for commercial and industrial use. The plenum is crafted in the United States and features a sturdy construction that ensures longevity and durability. The item is suitable for use with various types of HVAC and refrigeration systems, making it a versatile addition to any business or industrial setting. Its dimensions of 19.5 x 23.5 x 36 inches ensure that it will fit easily into most systems without the need for modifications. This unbranded/generic plenum and filter box does not specify its condition, but it is new and ready for use.