<html><head></head><body><div class="yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div dir="ltr" data-setdir="false">I'm looking to start a discussion to create a PSUBS standard for max/min cabin operating conditions. I'm not convinced temp or humidity matter all that much overall and require an agreement. I would start with the following:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">O2: 19.0 to 23 percent</div><div dir="ltr" data-setdir="false">CO2: 0 to 5000 ppm</div><div dir="ltr" data-setdir="false">Pressure: +/- 1psi</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Comments?</div></div></body></html>