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It looks like this might have something to do with differences in air density. The infiltration design flow rates are entered in volumetric flow units (m3/s) - but the hourly reports are showing fluctuations in mass flow units... When the OA temperature is low (i.e. the air is dense) the mass flow rates seem to be higher (and vice versa)...

However, the OpenStudio report lists an Average ACH and a Minimum ACH (both volumetric) and they are very different (by an order of magnitude for most zones)... Still can't explain this.