Horizontal Air Discharge Kit, Used On Gas Heat Models Only:R4GN Series And R6GP 120-235C, Return Duct Opening:16-1/2"H X 30"W,Supply Duct Opening:30"H X 16-1/2"W, Return Panel Dims:38-1/2"H X 33"W, Supply Panel Dims:50"H X 22-1/4"W, Kit Includes: (1) Supply Air Cover Panel, (1) Return Air Cover Panel, (1) Supply Panel w/ Duct Opening, (1) Return Panel w/ Duct Opening, (1) Return Filter Access Panel, (1) Bag Hardware (2) Clips and (6) Screws, Weight:40 Lbs, In Box, Made In Unknown.