Louvers Select from fusible link, inverted "Y" or windstorm louvers Rockwood LV-FL_ Fusible Link Fire Rated LouverFire Rated Louver for 1 3/4" Wood/Metal Door Rockwood LV-IY_ Inverted “Y” LouverInverted Y Louver for 1 3/4" Wood/Metal Door Rockwood LV-WS Windstorm LouverWindstorm Louver for 1 ¾” Wood/Metal Door