Patent ID: 7727765

Claim:
A method for leak testing the ventilation system of an environmental enclosure, the method comprising: inducing air surrounding the enclosure to flow through the ventilation system and a gas filter positioned in the ventilation system into the enclosure to establish positive pressure in the enclosure; filtering a tracer gas from the air flowing through the gas filter, the tracer gas comprising a gas naturally present in the air surrounding the enclosure; determining the expected predetermined concentration of tracer gas inside the enclosure based upon the efficiency of the filter; measuring the lowest achievable concentration of tracer gas inside the enclosure; and detecting for the presence of leaks in the ventilation system by comparing the lowest achievable concentration of tracer gas inside the enclosure to the expected predetermined concentration of tracer gas inside the enclosure based upon the efficiency of the filter, wherein the presence of leaks in the ventilation system is indicated if the lowest achievable concentration of tracer gas exceeds the expected predetermined concentration of tracer gas.