Curb Option-Built-in Louvers
BILCO roof hatches and smoke vents can be supplied with louvers built into their curb. A roof hatch curb with built-in louvers provides continuous building ventilation. BILCO louvered roof hatch curbs and smoke vents are equipped with a standard insect screen. In some areas, smoke vent curbs with built-in louvers are required in vents over elevator shafts to meet elevator-shaft code requirements.