Tornado Resistant Doors for Shelters & Safe Rooms | Meets FEMA 361 & ICC 500 | Steel Door Institute

Specialty steel doors can save lives in the event of a tornado. See how both a standard steel door and a tornado door hold up against a 2x4 flying at it 100mph.

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[clownworlddotfart]

So the first non SDI door you shot the 2x4 at the top corner away from the hinges and away from the door handle, basically where the door is weakest with no connection to the frame. Then on the SDI door, you shot the 2x4s at the strongest locations, right next to a hinge and then right next to the door handle/lock mechanism. That seems a bit skewed to show that as a valid comparison. You should have shot the SDI door in the same top corner location like you did the first door.