ASHRAE 62.2-2013 Easy-Peasy Ventilation Calculation with Corbett Lunsford

You will understand how to calculate ventilation for ASHRAE 62.2-2013 and you WILL NOT DIE FROM IT! Let's do this.

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Comment by Corbett Lunsford on October 22, 2013 at 2:58pm

Ed, I might be confused about your question, but the basement IS included in the CFA, and is NOT included in the height above grade (except for the part that is above grade).

Comment by Ed Minch on September 25, 2013 at 6:57am

Corbett says that the CFA is everything inside the envelope and he states that a garage, of course, is not included.  Then he says to measure the house from the ground to the top floor ceiing to get height.  But then when he does a sample calculation on a house in Chicago, he doesn't include the basement even though he has measured part of the height of foundation.  In my limited experience, every house in Chicago has a basement - so is it included or not?

I don't think I want my staff running around with scientific calculators, but it is a good explanation of what goes into the math.

Comment by Rick Shappy on September 24, 2013 at 2:54pm

If there is vermiculite or asbestos present and depressurization is not allowed do you not use an average blower door test?

Comment by Rick Karg on September 23, 2013 at 8:48am

For those of you who might find these simplifications not quite so simple, check out the RED Calc Free calculation tool at: With this free web based software, no calculations are required and it includes the Alternative Compliance path for existing dwellings. It also helps size rates for intermittent whole-building ventilation.

Comment by Greg Labbe on September 23, 2013 at 7:25am

Very well done! Thanks!


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