Broan Broan 332KR Rough-In Kit for 10-Inch Round Duct
Rough-in Kit for Models 331H, 332H, 335 and 336 exterior blowers and HLB3, HLB6, HLB9 and HLB11 in-line blowers. Fits 10-Inch round duct. Only for use with RMIP insert.