Providing a louver that didn’t look typical but still functioned like one was a priority for the architects at SOM. Requirements included allowing a significant amount of airflow to pass through the louvers, low pressure drop and water entry.


We helped SOM and the project’s mechanical engineer design and develop a wind-driven Class A-rated louver. This custom system was created by using elements of three different louver models to obtain the right amount of airflow and provide water resistance for the HVAC system, which spans 18 floors. The system, first proven in our exclusive test chamber, acts as a reverse plenum since the louvers are fully exposed to the weather.

Case Study The process of making Architectural Louvers

Project: One World Trade Center

Location: New York, NY

Architect: Skidmore, Owings & Merrill LLP


Custom Storm-Resistant Louvers

The making of WTC


One World Trade Center Facts

Floors of Louvers

Sq Ft of Louvers

Tons of aluminum

Gallons of PVDF Finish

A stone’s throw away, at the state-of-the-art World Trade Center Transportation Hub (aka, “The Oculus”), CS Blast-Resistant Horizontal Louvers (BLH-5709) assist with airflow while providing blast resistance at the base of the structure’s “ribs.” The visually poignant 800,000- square-foot hub, completed in 2016, serves 250,000 commuters daily and is the third largest transportation center in New York City. Ultimately, the facility will connect guests to 11 subway lines and World Trade Center Towers 1, 2, 3 and 4.

The process of making Architectural Louvers

Project: World Trade Center Transportation Hub

Location: New York, NY

Architect: Santiago Calatrava

Product: CS Blast-Resistant Horizontal Louvers

One World Trade Transit Hub

Commuters per day