Indoor air quality discussion

[AC_Hacker]

This is very useful information.

Originally Posted by JRMichler

Our house was... tested ... It came to 1.0 ACH50. That correlates roughly to 0.05 ACHnat (actual ACH under normal weather conditions).

I think that too many people underestimate what the Passive House target of 0.35 ACH50 really amounts to... it is almost a hermetic seal. 1.0 ACH50 is not Passive House, but is quite respectable.

So if your house is 1320 SF, and assuming 8 foot ceilings, its volume would be 10560 cubic feet, and your non-mechanical air exchange would be 528 cubic feet, and your 35 CFM (2100 CF/hour) for a total of 2628 CF/hr, which would translate to 0.25 ACH.

I did read some German research that measured improved academic performance if high school kids had ACH => 1.

Best,

-AC