CURRENT U.S. HURRICANE LOUVER REQUIREMENTS: State of Florida – Florida Building Code (FBC) and Florida Mechanical Code (FMC)
Atlantic and Gulf of Mexico Coasts outside of Florida – International Building Code (IBC) and International Mechanical Code (IMC). To determine the appropriate edition of the codes per region, reference ICC’s code adoption site at www.iccsafe.org/adoptions. Miami-Dade and Broward Counties – Miami-Dade County launched a product control program, with testing and approval requirements for a wide variety of building materials and products (including louvers) used within the county. Houston, TX – Follows the 2021 Unified Mechanical Code (UMC) in lieu of the IMC. Variations exist in some areas, verify specific local codes. See the region map below for more definition.
State of Florida – For ventilation louvers within 30' of grade in Wind-borne Debris Regions, AMCA 540 Basic or Enhanced Impact Resistance per the FBC (Enhanced for Essential Buildings). For all air intake and exhaust louvers, AMCA 550 High Velocity Wind-Driven Rain Resistance per the FMC. These qualifications are confirmed with Florida Product Approval. For the High Velocity Hurricane Zone (HVHZ) of Broward and Miami-Dade Counties, Miami- Dade Approval, also known as NOA (Notice of Acceptance), is used to validate the design and installation methods of louvers for the area’s elevated hurricane conditions. Note: the FBC has Testing Application Standard (TAS) test protocols that may be used in lieu of AMCA tests for Miami-Dade Approvals.
Atlantic and Gulf of Mexico Coasts * – For ventilation louvers within 30' of grade in Wind-borne Debris Regions, AMCA 540 Basic or Enhanced Impact Resistance per the IBC (Enhanced for Essential Buildings). For all air intake and exhaust louvers in Hurricane Prone Regions, AMCA 550 High Velocity Wind Driven Rain Resistance per the IMC and UMC. Florida Product Approval and Miami-Dade Approval are not required by code. In All Areas – hurricane louvers must be fabricated to withstand the appropriate wind loads for the project. For wind load calculation, refer to the appropriate Building Code for the region. In addition to the impact and wind driven rain testing requirements described above. *Outside of Florida
Texas Department of Insurance (TDI) – For louvers installed in the coastal areas of Texas, the TDI offers evaluations and approvals for products that comply with their approved building specifications. While TDI approval is not required by code, it is required on projects that will seek windstorm insurance eligibility through the Texas Windstorm Insurance Association (TWIA). Refer to the TDI website for more information.
HURRICANE AFFECTED AREA BREAKDOWN
HIGH VELOCITY HURRICANE ZONE (HVHZ) is a Florida Building Code term that refers specifically to Broward and Miami-Dade counties. The FBC requires cyclic pressure testing for louvers installed within the HVHZ. WIND-BORNE DEBRIS REGIONS include territory within one mile of the coast where further inland where the design wind speed is at least 140 mph. These design wind speeds are determined from the IBC maps based on the type and purpose of the building in question. HURRICANE-PRONE REGIONS are areas along the US Atlantic and Gulf of Mexico coasts where the wind speed on the Risk Category II map* exceeds 115 mph. This also includes: Hawaii, Puerto Rico, Guam, Virgin Islands, and American Samoa.
HAWAII
HVHZ
*Risk category II as defined by IBC is shown as the Hurricane Prone Regions on the map plus the Wind-Borne Debris Regions and HVHZ
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