Roof vent system which prevents roof loss / lift off in high winds

Abstract

This is a system of roof vents, which prevents a pressure difference across a roof (i.e. between the interior and exterior of the building) sufficient to lift the roof off. It involves a calculation, which quantifies the surface area of open venting that is required to prevent roof loss for each given building. It also specifies where that venting must be placed on the roof of the building. I have described three different vents, which represent the preferred venting designs to be used in this system.

1 ) Invention of a roof vent system, which uses vents for the purpose of preventing the occurrence of a pressure difference greater than a specific set value across a roof (across a roof meaning between the interior and exterior of a building). This involves an understanding and use of a vent's ability to limit the maximum pressure difference that may occur, as opposed to previous claims made for the use of vents as a pressure equalization or pressure relief tool. (Refer to detailed explanations in the previous text). 
 I claim the invention of a vent system, which acts to limit the pressure difference that can occur across a roof and the use of vents as a pressure-limiting tool within that system.    
     
     
         2 ) The design of the vent types which are preferred for use in this system. (As described previously, p10-20)