Dual Lid Smoke Vent on Louvered Base​

Model No. Example: 4896 S-ULSV2D-L3-CM-MF
4896 Steel frame Smoke Vent Dual Lid Smoke Vent Curb Mount with a Louvered Base Option
FM Option Model Number Example:4896 A-FMSV2D-L3-CM-ST-MF-OR-370
4896 Aluminum frame FM Approved Dual Lid Smoke Vent Single Dome Curb Mounted Mill Finish with a Louvered Base Option