The Tinman brand Supply/Return Air Duct Plenum is a 20x20x24 long galvanized steel rectangle with 2/14" holes, suitable for various HVAC systems such as ducted evaporative coolers, packaged rooftop furnaces, and heat pump split systems. It can be used for both updraft and downdraft installations, making it a versatile accessory for businesses and industrial settings needing to regulate and filter air in their systems. This durable 26 gauge galvanized steel plenum is designed to effectively supply and return air in a variety of heating and cooling applications.
eBay