“…The second method, developed by Lotens and Havenith (1988), uses a diluted tracer gas (usually Argon), that is blown into the microclimate in a continuous stream, and the steady state microclimate concentration is sampled, from which the ventilation (volume per time) can be calculated directly (Havenith et al, 1990(Havenith et al, , 2003. This method has been shown to be repeatable and accurate, if the tracer gas is distributed equally over the microclimate regions.…”