OklahomaTornado Shelters

Because the safest place during a tornado is underground!

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Oklahoma Tornado Shelter Research & Development

 

Granger ISS Tornado Shelter Aluminum Door

Watch as the 2nd designed & produced Storm Shelter door by Granger Industries, Inc. successfully completes the FEMA 320 debris impact testing at the University of Texas Tech Wind Science Labs! This door has since been re-designed, re-innovated and re-tested at Texas Tech Wind Science & Engineering Research Center. All orders now come standard with the multi-layer composite storm shelter door.

Composite Door Research & Development

After successfully designing & producing the first (2) Aluminum doors to ever exceed FEMA 320 standards for underground shelters, Granger Plastics opted to design & test a multi-layer composite door. The clip below is from the beginning stages of development as Granger repeated a number of destructive tests to simulate projectiles and tornado debris, as reconstructed inside of a testing center, such as Texas Tech University's Wind Science Engineering Center. Watch the clips below as Granger takes a heavily weighted 2 x 4 and drops it from tall heights against single layer components.

Multi-layer composite Door Texas Tech FEMA 320 and FEMA 361 testing

 

Texas Tech Wind Science & engineering Research Center Debris Impact Test Facility Information

The images and the reports below are the results of the Texas Tech Wind Secience & Engineering Research Center Debris Impact Facility's testing on the Granger ISS Storm Shelter door. The underground shelter door meets or exceeds FEMA 320 and ICC-500 Shelter Standards. View the reports and images for more details.

Shelter Door Construction

Series 1 Impact 1

Series 1 Impact 2

Series 1 Impact 3

Series 2 Granger ISS Tornado Shelter Door FEMA 320 & ICC-500 testing

Series 2 Impact 1

Series 2 Impact 2

Series 2 Impact 3

Series 2 Impact 4

Series 2 Impact 5

Series 2 Impact 6

Granger ISS Tornado Shelter Door after (6) Impacts

Granger ISS Tornado Shelter Door after (6) Impacts

Click the image above to read the 2 page Test Results summary from the Granger ISS Storm Shelter testing report from Texas Tech University's Wind Science & Engineering Research Center.

Video of the Granger ISS Tornado Shelter Door FEMA 320 & ICC-500 testing

3rd Party Structural Analysis

In effort to produce the highest quality underground storm shelter, Granger Plastics Company had a 3rd party engineering firm perform structural analysis by a licensed P.E.; This structural analysis report is an extremely in depth analysis on the Granger ISS Storm Shelter, it's ability to stay in the ground without an anchoring system, ground pressure analysis, hydrostatic pressure analysis and more. This 117 page report is available to our dealer network.