This Master Flow RD3.25X14X36 rectangular stack duct is constructed from durable 30-gauge galvanized steel and is designed for HVAC applications. Ideal for space-saving installations between wall studs, it facilitates efficient supply and return airflow or venting for range hoods and bathroom fans. The half-section design features notched corners that allow for easy tool-free assembly when two pieces are snapped together. This 3-foot section can be easily cut to custom lengths to fit specific residential venting needs in attics or overhead floor joist spaces

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