The tinman supply air duct plenum is a rectangular-shaped product made of 26 gauge galvanized steel. It has dimensions of 18 x 18 x 24 inches and is compatible with various HVAC systems such as ducted evaporative coolers, packaged/rooftop furnaces, and central air conditioners. It features both updraft and downdraft installation options and comes in a unit quantity of 20. This plenum is designed to connect the HVAC system to the main supply duct and is a crucial component in ensuring proper air distribution throughout a building.
eBay