The product is a rectangular plenum made of galvanized steel with a gauge of 26. It has dimensions of 21 inches by 16.5 inches by 30 inches and is suitable for both updraft and downdraft installation. It is compatible with various HVAC systems such as ducted evaporative coolers, packaged/rooftop furnaces, and central air conditioners. The product comes in a unit quantity of 20.
eBay