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Adam Cohen
Regenerative Explorer

If power goes out just crack a window.  The CO2 will normalize.  You do not need to open a window fully for this to happen 

Hi Frank,

Indeed, I have been speaking to this for many years. Measuring efficiency of H/ERVs is actually much more complicated than most know. That said, there is a fundamental difference between PHI and HVI/AHRI. PHI measures efficiency with the... (More)

Prudence Ferreira
Passive House Practice Lead - Morrison Hershfield

Frank- Vive la difference!

Depending on location this issue of testing methods and modeling of ventilators for PH certification can be a pretty big deal for clients when it comes to supply chain and the desire to avoid sole sourcing.... (More)