What is meant by impact rating and why is impact rating important?

When a door has attained a "Missile Impact Rating" it means that it has been laboratory tested to withstand the force of a 9# 2x4 approximately 6 feet long, fired at 50 feet per second (about 34 MPH) into its face in various locations. This test is designed to simulate the impact of flying debris during a high wind event.

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