Hello there, For garage spaces that are designed for CO/NO₂ monitoring and have a neutral (Exhaust air – Supply air = 0) pressurization. Please clarify how the average pressure differential with the surrounding spaces should be calculated.

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Jean Marais

b.i.g. Bechtold DesignBuilder Expert

LEEDuser Basic Member

581 thumbs up

Wed, 03/02/2016 - 07:42

In this case, you don't under pressure the garage space (often it is open to outside via the ramp, so it's impossible anyway). You must overpressurise the connected spaces so that the calculation of the airflow from a connected space (which is supplied more air than extracted) to the garage across cracks, grills and door undercuts shows a pressure difference as required by LEED. In the construction phase, you could even measure it.

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