Thanks Martin and John, It makes sense to leave the "intentional openings" unsealed for a blower door test. Though the HRV openings combined are rather large, and must end up increasing the overall air leakage, which will affect the score and ultimately the rebate that the program calculates based on among other things the blower door test.
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The Minneapolis Blower Door is a system automatically controlled from the DG-1000 pressure gauge - you just monitor the readout of the measured results on the screen. Using these results, the included software generates a complete test report in accordance with worldwide standards such as ATTMA, Passive House and ISO 9972.

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