From The Manufacturer
Enervex Galvanized Roof Curb for GSV012 - GSV014 - GSV200 Fans - The RCF Roof Curb is a self-flashing type of curb designed for use with GSV, EFV, RSV and BEF models on flat roofs. The design makes installation very easy and eliminates the need for securing roofing papers onto the side of the curb wall. A flange is provided for fastening into the roof deck, so roof material only needs to cover the flange. A neoprene gasket is secured onto the top of the curb. Wood nailers are not required but can be supplied as an option. The roof curb is made of 18GA Galvanized steel and is fully welded. All corner seams are liquid-tight due to the continuous weld. The standard curb is not insulated, but as an option it can be supplied with 1 1/2" thick insulation for thermal protection and soundproofing.
