What do I need to do different when performing a pressurization air tightness test?

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You will need to turn the fan around so the flow rings and flow sensor are outside.  Older fans have a reverse switch, but the switch cannot be used when you are measuring air flow.  If the DG-700 is inside the house, you will also need to install a third tube on your DG-700.  That tube will go from the reference tap of channel B to the outdoors near the side of the fan, but not in the fans airstream.

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