flue effect

chimney effect, flue effect, stack effect

The tendency of air or gas in a shaft or other vertical passage to rise when heated, owing to its lower density compared with that of the surrounding air or gas.
References in periodicals archive ?
It's the flue effect that causes fire to spread rapidly.
Rather than run the HVAC system all the time, operators can pop open the roof and wall panels to create a flue effect on nicer days, Mendioroz says.