Texas Tech University

NWI Debris Impact Facility


The National Wind Institute (NWI) Debris Impact Facility (DIF) is intended to promote public safety and welfare and helps prevent deaths and lower property losses incurred due to extreme weather events and their effects.
DIF is an A2LA accredited ISO/IEC 17025-2005 test laboratory. DIF offers accredited storm shelter, safe room, commercial and residential door, window, and other components testing, including the structural performance of exterior doors, windows, curtain walls, and skylights by uniform static air pressure testing using FM Global Approved TTU DIF Air Bladder Standard 1.1.2016. All testing is in accordance with FEMA 320 and 361 guidelines and ICC-500 standards, ASTM E1886, DOE-STD-1020-2002, and Miami Dade County Florida Building Code (Hurricane testing). Uniform static air pressure testing is done to determine the ability of elements of the building envelope to remain unbreached during severe windstorm event, including hurricanes or tornadoes.

The heart of the DIF is a pneumatic cannon capable of firing simulated projectiles propelled by high wind speeds during a tornado and/or hurricane. The cannon can launch different types of simulated wind-born debris in a controlled environment to provide valuable impact resistance data.


The cannon plays an important role in researching effective tornado shelters for use in homes and other structures. The cannon is used to develop standards for safe above ground shelters and continues to be in demand for testing new shelter materials and constructions.

The DIF has also been selected for Popular Science's "Most Awesome College Labs 2013" and as one of "PopSci's Most Awesome College Labs 2011".

Watch a video demonstrating the debris impact cannon in action. This video is an impressive, slow-motion real-life impact of a sample debris cannon missile.




The Debris Impact Facility has implemented a new "Verification" process. Once the product has been tested, passed, and approved, we provide 10 product verification labels.  Each additional label may be purchased separately. Each product verification label is specific to the MODEL # given to the product in the testing report. We require re-test of products every five (5) years in order to keep your verification information current.  As seen below, each testing label has a QR code that enables customers to quickly verify your product has passed approved testing.