Patent ID: 7717776

Claim:
A method for the controlled feeding of added air into a permanently inertized room in which a predefined inertization level has been set and is maintained within a certain control range, said method including the following procedural steps: providing for the supply of an inert gas, employing an inert-gas source, in particular an inert-gas generator and/or an inert-gas reservoir; controlledly injecting of the supplied inert gas, via a first feed line system, into the atmosphere of the permanently inertized room at a first volume flow rate (V N2 ) that is capable of maintaining the predefined inertization level and of removing from the room atmosphere airborne hazardous substances, especially toxic or otherwise harmful substances, biological agents and/or moisture; providing for the supply of fresh air, in particular outside air, employing a fresh-air source; and controlledly injecting of the supplied fresh air, via a second feed line system, into the atmosphere of the permanently inertized room at a second volume flow rate (V L ), said value of the second volume flow rate (V L ) at which the fresh air is injected into the room atmosphere being determined by a minimum air exchange rate that is required for the permanently inertized room, and by the value of the first volume flow rate (V N2 ) at which the inert gas is injected, wherein the second volume flow rate (V L ) is greater than or equal to the difference between a minimum added-air volume flow rate (V F ) necessary for maintaining the minimum air exchange rate required for the permanently inertized room, and the value of the first volume flow rate (V N2 ) needed for maintaining the predefined inertization level of the atmosphere in the permanently inertized room.