Okay, so has anyone had time to scrutinize the just-released ASHRAE 62.2-2013 standard?  How different is it from Addendum r?

I see it has finer increments in the Ventilation Air Requirements table 4.1.  That's good.

Be sure to get the Errata sheet.

Qinf = may be no greater than 2/3 * Qtot.  I read that as meaning even leaky houses may need mechanical ventilation. 

Anyone have a -2013 spreadsheet calculator yet?

Will the $20 iPhone app offer a free upgrade, or will it cost me another $20?

So many questions, just before ACI, which begs one more question; how many sessions at ACI will be based on the -2010 standard?  


Tags: 62.2-2013, ASHRAE

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OK, one question/answer at a time:

Yes, I have scrutinized the 2013 and presented a session at ACI Denver (May 2013) with Paul Francisco that compared 62.2-2010 with 62.2-2013.

Qinf may not be greater than 2/3 Qtot for NEW homes only. This is not a limitation for existing homes.

Yes, Residential Energy Dynamics (RED), my company, has its RED Calc Free 62.2-2013 tool up and running. Check it out at http://www.ResidentialEnergyDynamics.com. It's fun! To go to this tool directly: http://www.residentialenergydynamics.com/REDCalcFree/Tools?tool=ASH...

Yes, my ResVent 62.2 app for the iPhone and iPad will be updated for the 2013 version. It will not cost another $20, but will be a free update.


Excellent calculator, Rick, very much appreciated.

Thank you, David. Watch the RED website; more tools and features are being added frequently. 

Very convenient web tool, Rick, makes it easy to run the calculations.  I'm glad to see the improvements in 62.2-2013, such as more weather stations and a refined Table 4.1.  

The ELA calculation is still a thorny calculation, neither the ASTM nor the CGSB procedures are very practical in the field.  It's easier to use Equivalent Leakage Area (sqft):     EqLA = (CFM50 X 0.055)/144.  

I understand Paul Francisco has an alternative means to calculate ELA and Qinf.  What is your opinion of his approach?  Should an "authority having jurisdiction" consider it as a more practical field approach?

I think the Prescriptive Duct Sizing in Table 5.3 opens up a can of worms for flex duct, I would prefer folks used actual airflow measurements.  Prescriptive flex duct sizing may provide too many opportunities for error and result in actual airflow being less than prescribed.  I'd rather see this in the Guidelines and airflow in flex ducts be measured rather than calculated.

Will your ResVent 62.2 app eventually provide both the 2010 and 2013 calculations?  It depends on which state I'm in as to which version I need.

I would have sat in on your ACI session, but I had one of my own to deliver at the same time. Is there an audio of your session?


Paul Francisco's alternative method is just fine. He has simplified the math for the procedure. Even with Paul's simplification, a spreadsheet or calculation sheet is a good idea.

Regarding ductwork, remember that the ASHRAE 62.2 Standard is a minimum requirement, it is not necessarily best practice. The 62.2-2013 Users Manual will include recommendations and examples for duct installation and other details. This manual will probably be another year before completion.

The plan now is to update the ResVent 62.2 app for the 2013 version of the standard. 

Great to see you at the conference. I am sorry we couldn't get to one another's sessions.


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