Winchester Galvanized Steel RAB 21 Duct Part for Side Return Air Application, 26 Gauge, 21-in x 28 RAB21

This assembly is designed to convert upflow forced air equipment with bottom returns to side return air return applications to accommodate installation of the RA16 return air drop assembly. When installing the 21 in. wide WMP series air handler in an upflow application, the RAB 21 converts the bottom return air application into a side return air application Use with the model RA16 return air drop assembly for a complete side cold air return; for upflow applications only Ships flat for field assembly CA Residents: Prop 65 Warning(s) Prop65 Warning Label PDF Instructions/Assembly PDF