Smoke vents must stay closed during hurricanes but open instantly during fires. Watch how these dual requirements create unique engineering challenges.
How smoke vents balance fire protection with hurricane resistance.
Wind-Rated Hold-Downs
Heavy-duty latches rated to resist full design uplift. Release only when activated by heat, smoke, or manual controls.
Fusible Links
Temperature-rated links (165F or 212F typical) that melt to release the lid for automatic fire venting.
Reinforced Curb
Steel curb with integral flanges for positive anchorage. Sized to transfer full wind loads to roof structure.
Smoke Vent FAQs
What wind loads do smoke vents experience in Florida?
Smoke vents in Broward County experience the same wind uplift as other roof-mounted equipment. At 175 mph design wind speed, a 4x8 foot smoke vent might see 2,500-4,000 lbs of uplift depending on roof zone. The vent must remain closed and functional during high winds to maintain building enclosure until fire activation.
How do smoke vents stay closed during hurricanes?
Smoke vents use wind-rated latches or hold-down mechanisms that keep the lid closed against design wind loads. The latches release only when activated by heat (fusible links), smoke detection, or manual controls. Quality hurricane-rated vents have latches tested to resist the full design uplift pressure.
Do smoke vents need Miami-Dade or Florida Product Approval?
Yes. Smoke vents installed in the Florida High Velocity Hurricane Zone need Miami-Dade NOA approval. Outside HVHZ but within the Florida Building Code jurisdiction, vents need Florida Product Approval. The approval documents the wind load rating, curb requirements, and installation specifications.
What is the curb height requirement for smoke vents?
Smoke vent curbs typically need to be 8-12 inches high for proper water management and lid clearance. The curb must be structurally adequate to transfer wind loads to the roof structure. Curbs are anchored at 12-18 inch spacing with fasteners sized for the design uplift and lateral loads.
Can smoke vents operate after a hurricane?
Properly designed smoke vents should remain operational after a hurricane. The hold-down mechanisms protect the operating components during the storm. After winds subside, the fusible links and opening mechanisms should function normally. Post-storm inspection is recommended to verify operation.
Calculate Your Smoke Vent Wind Loads
Get the exact uplift forces and hold-down requirements for your Broward County smoke vent installation.