When the Screens are in the downward position, Talius’ unique edge retention system allows the Screens to withstand winds up to 100 mph depending on the size and mounting conditions of the Screen unit. This is an estimation of wind loads only. Internationally recognized testing in a controlled environment to determine these estimates. As Mother Nature does not act in this same controlled way performance may vary. In areas susceptible to high winds, we strongly recommend the use of a wind sensor to protect the integrity of the Screen. We do not recommend that you operate your Screens in windy conditions. Downward operation is hampered during windy conditions due to the friction and resistance created by the wind pushing against the screen fabric. Upward operation can be performed even in windy conditions.