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The simplified Prescriptive compliance approach for additions is limited to additions that are 1,000 sqft or less, however, additions greater than 700 sqft now require QII and HERS verification.  As such, you cannot use the simplified approach.  For additions larger than 700 sqft, you will be required to use the Performance approach, since this addition will required HERS registration and testing for the QII inspections and IAQ fans, and possibly other measures.  Under the Calculations, select the NR T24 Performance for your calculation.


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