The fan resists humidity, heat and cold (as better clarified in the use and maintenance manual). It has been designed specifically to operate in highly corrosive environments or in environments with abrasive substances. The fan shall only be used for the purpose for which it is designed and in compliance with the law. The user has the responsibility to require an adequate motor to be in compliance with local legislations. Standard shutter wall fans are equipped with one protection grid only. Local legislations may require an additional safety grid for the shutter. This may be connected to the height of the installation. The customer is responsible to check compliance with local legislations and require an appropriate grid, if needed. Please refer to the use and maintenance manual for any further clarification.