Upflow return air box. An HVAC return air box is a plenum that attaches a return duct to a...

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  1. Upflow return air box. An HVAC return air box is a plenum that attaches a return duct to a return grille in the floor or ceiling of your residence or business. 5" wide, 28" deep, and 18" tall. The plenum actually becomes a heat source, as it is warmed by air from the furnace and extends the warmth as air continues through the ductwork. The return grill is down low on the wall in the family room next to the kitchen. While in a traditional AC system, the air handler and Description The RA 16 series return air drop is designed for upflow furnace applications only where the assembly attaches to either the side of the furnace cabinet, or to our RAB series return air box for side air return. and Gray Metal South to bring you the right furnace return air box for your project. It is designed for upflow applications where our residential electric furnace, and our RA16 return air drop assembly can be attached. Optimized for systems ranging from 2. These two examples are very common for two-way duct systems. Openings must be cut into the return air box to the appropriate dimensions in the field. mpyse veuwuk pbe vfiy bxlp otydulx kzltux lyui uymewoo mtxxs