What Is Design Pressure (DP) Ratings?
DP ratings indicate the amount of pressure a particular class of doors can withstand.
After a product has been impacted, it is subjected to 9,000 wind cycles. The air pressure inside reduces while the pressure outside increases until the product shatters. For a door to pass the test, it must withstand a test pressure of above 1.5 times its design pressure for 10 seconds without getting damaged. Therefore, products with a high DP rating are more robust than those with a lower rating.