Universal Boot With 1 in FlangeUniversal Boot With 1 in Flange, 4 in L Register Opening, 10 in W Register Opening, 7-1/2 in HDescriptionECCO Manufacturing™ Universal Boot With 1 in Flange, Compatible Duct Diameter: 4 in, 4 in Register Opening Length, 10 in Register Opening Width, Galvanized, 7-1/2 in Height
ECCO Manufacturing, Universal Boot, P5 Series, 094420, 4in L Register Opening
