Turbine Ventilator, External, 4 in Throat Dia., 126 CFM @ 4 MPH Wind/ OVERALL HEIGHT: 12.00 INCHES NOMINAL OVERALL WIDTH: 10.25 INCHES NOMINAL SPECIAL FEATURES: GALVANIZED STEEL TURBINE; 4.00-INCH NECK DIAMETER; ALUMINUM EXTERNAL BRACING; BASE NOT INCLUDED; CFM AT 4 MPH:126. DISTRIBUTOR LISTED AS RNCC/VC:3/2 CAGE/PN:25795/TV04G, BECAUSE OEM EMPIRE, DOES NOT HAVE A CAGE CODE