Wide ventilation louvers are certified in accordance with EN13030 by the VTT Technical Research Center of Finland. Our ventilation louvers meet class "A", the best class for water discharge and according to class «1», the best class for pressure drop. To achieve class A for water discharge, the ventilation louver should stop more than 99% of rain. Wide ventilation louver stops 100% of rain. In addition, Wide's ventilation louver stops up to 100% of the fog for airspeeds above 2 m/s. The EN 13030 criteria do not include fog.
To achieve class 1 pressure drop, the maximum permissible pressure drop is at 2 m/s, approx. 15 Pa, and for 3 m/s, approx. 35 Pa. The pressure drop for Wide's ventilation louver type SP has a pressure drop of 13 and 27 Pa, respectively.