Patent ID: 6293861
Filing Date: 2001-09-25
Classification: F24F,Y02B,Y10S

Abstract:
A method for protecting a building against a personnel attack by one or more biological, chemical and nuclear hazardous airborne contaminants, the building having one or more external air communication openings between a building interior and a building exterior, the method including:sensing exteriorly of the building the concentration of one or more of said hazardous airborne contaminants at one or more perimeter locations spaced from the building,determining when the concentration of any hazardous airborne contaminant sensed at a perimeter location is at or above a first contamination level for said hazardous airborne contaminant,immediately closing and sealing said external air communication openings when the concentration level for any of said hazardous airborne contaminants at a perimeter location reaches or exceeds said first contamination level for the respective hazardous airborne contaminant, andpressuring the interior of the building to a pressure above the pressure externally of the building after closing and sealing said air communication openings.